Thank you for contacting us!

Our head office is located in Groningen, we call it ‘De Zeven Linden’ (Seven Lime Trees). Since March 2017, we have a second location in Amsterdam, the building we call ‘De Paddestoel’ (The Mushroom), due to its architecture.

At the bottom of this page you will find the visit (and post) address for both locations.

We can imagine that you have questions, so we are happy to help you. If you want to call us or send us an e-mail, you can do so through the following contact information:


Phone: 050 – 502 0680

Opening hours: From monade to Friday from 9.00 tot 17.00 hours, except national and school vacations.


Visit (en post) address of location in Groningen 

Middelberterweg 13a
9723 ET  Groningen


Visit (en post) address of location in Amsterdam

Kometensingel 175
1033 BE Amsterdam

Last-minute line Amsterdam: If you can not reach our office and you are late for a course/workshop in Amsterdam, please call 020 354 2167.