Onesta real estate

The real estate market can be very dynamic. One year, properties won’t sell and rentals remain vacant. The next year the interest drops to historic lows and the housing market overheats. That calls for a calm and stable partner. At Onesta, we always keep our heads cool and our eyes on the ball!

Because of our efficiency and transparency, you can rely on our professional services without being confronted with extra work or extra fees.

We work together with Royal Mortgage Service, a highly recommended mortgage and insurance broker. We combine our efforts to offer you the best service for your money.

We are a one stop shop for:

  • Buying and selling assistance
  • Rental assistance, both for tenants and landlords
  • Expat services
  • Property and asset management
  • (Certified) valuations
  • Mortgages
  • Insurances

Both Onesta and Royal Mortgage Service have many years of experience working with expats and internationals. We have specialized in expat housing and expat mortgages. We speak English, Spanish, German and Dutch of course.

onesta makelaar den haag

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You will find our office at the Denneweg 9-d around the corner at the Lange Voorhout in the cozy Buurtschap 2005.

Recently we have also opened a second branch at the Scheveningen harbor, at Van Bergenstraat 49 to be exact (crossing Statenlaan / Westduinweg).

Meet the team of Onesta real estate

team onesta vastgoed Melanie

Melanie Barsoumian

Certified realtor / valuer

In 2008 – at the height of the financial crisis – Melanie decided to start her own real estate agency. Today, Onesta has two offices in The Hague, staffed by a wonderful team of professionals. We share a passion for real estate and we are driven by the best results for our clients.

From the start, Melanie focused on expat housing. She likes to make expats feel at home in this beautiful city. A little later, she started buying and selling real estate for Dutch clients and investors as well. Today, Melanie is very proud to be a certified real estate valuer. She spends a lot of time growing her network and her knowledge about the regional real estate market.

The team is extremely important to Melanie. Together, they determine the strategy and plan for the future. The values they share are integrity, responsibility and transparency. Onesta is here to help you!


team onesta vastgoed Vincent

Vincent de Wit

Certified realtor / valuer

Vincent has been a realtor in The Hague for more than 10 years. What fascinates him is that many of the clients he helped buy their first home, come back years later when they are ready to move to a bigger house. ‘Onesta grows with you’ is very much true for the long term relationship Onesta wants to build with clients.

Vincent is our expert in commercial real estate and first contact for investors and housing corporations. With his experience, he is a partner at the drawing table for large scale projects.

team onesta vastgoed Sarah

Sarah van der Heijden

Rental agent

Sarah has been our expert rental agent since 2015. She will not only find the right rental property for you, she can also perfectly match a tenant to a landlord. Having lived abroad herself, she can relate to what an expat needs and wants. Furthermore, Sarah speaks Dutch, English, Spanish and German and she is committed to make you feel at home in your new house as quickly as possible.

Sarah’s expertise also consists of the legal side, i.e. protecting owners and tenants through clear rental agreements, rental property valuations, and asset management. Furthermore, based upon her experience, Sarah has a creative talent for positioning your rental property in the market.


team onesta vastgoed Jober

Anouk de Loos

Office manager / Rental agent

Anouk has been a member of the Onesta team since 2017. While she holds a degree in tourism and travelled the world, she is very content with this career switch. Helping people find the house of their dreams is perhaps even more satisfying than booking a dream holiday.


Over time, Anouk specialized in the rental market. She’s an excellent matchmaker, finding tenants the right property and landlords a suitable tenant. Furthermore, Anouk is the backbone of the organization, both our realtors and our clients rely on Anouk’s assistance.


team onesta vastgoed Boris

Boris van der Heijden

Realtor / Valuer (trainee)

Coming from a realtor family, Boris has always had an interest in real estate. He’s glad he can gain practical work experience at Onesta while completing the real estate training. He started at Onesta in 2017 as an intern and was invited to stay on while graduating. It is his pleasure to help you find, sell or rent your home.

team onesta vastgoed Claudio

Floor Peijnenburg

Backoffice assistant

Floor is currently studying law with a special interest in real estate law. Combining her studies with her role at Onesta Real Estate allows Floor to gain valuable work experience. Customer service is what Floor does best, ready to help our clients each step of the way.

team onesta vastgoed Colin

Colin Tetteroo

Backoffice assistant

Colin has been a member of the Onesta team since 2016. While working towards a degree in law, he supports the Onesta team with administrative tasks, preparing contracts and documents, planning maintenance for asset management etc. Colin makes sure that our clients receive the highest level of service that Onesta stands for.


team onesta vastgoed Claudio

Thierry van Splunteren

Backoffice assistant

Thierry found his first rental home through Onesta. It sparked his interest for real estate and inspired him to become a realtor and valuer himself. He was very happy to come and support the backoffice team in these hectic times. While selling and buying are his passion, Thierry is now mostly assisting the valuers with administrative tasks. This allows him to acquire experience as an all-round real estate partner.

team onesta vastgoed Martine

Martine Mulder

Purchase realtor / valuer  

At the start of 2019, Martine transferred to Onesta Real Estate after 25 years of experience with other real estate agencies. Onesta keeps up with the times and has a young and energetic vibe, which has great appeal in the real estate market.  

Besides real estate sales and rentals, Martine is specialized in purchasing and valuing real estate. She has always done this for real estate agencies and housing corporations. No workday is the same, one day you find affordable housing for a client and the next day you value a multi million euro property. Guiding people through the process is what Martine likes about her job.

team onesta vastgoed Manuel

Manuel Barsoumian

Financial administrative assistant

Manuel is our financial and administrative specialist.



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