I have a suggestion for a location, but if it's bad for others then it's a no.
We could rent a room at the Uithof in Utrecht. (The Uithof is the main campus of the University of Utrecht). The prices are really low, and the rooms are pretty good. If I can manage to rent the room 'internally' then it'd cost about €30 for an entire day. Otherwise it's <€300 for an entire day. Additionally it's easy to get there both by car and public transport. It's also very convenient for me personally in organizing it, since I'm studying at the University of Utrecht. Meaning I can check out the size of the rooms really easily.
However, they say that renting a room on Saturday or Sunday costs extra. And there's a chance you're only allowed to use the rooms for University related activities as well. I'll ask tomorrow.
Edited by Tilpo - 9/24/12 at 7:50am