Staying on a houseboat was a great experience! It's nicely kept in the old style without missing any luxury from today's world (fully equiped kitchen, nice bathroom etc). The location is great as it's just between the historic center and the more "young" part of the city in the south. Plus: the tram stop and a street with nice restaurants is only a few minutes walk away!
Derk is also a great and very uncomplicated host. Timings for key handover was perfectly flexible.

Really recommendable!