If you have the opportunity to stay in this fantastic place, I urge you to. Not often does one get the chance to live inside an 18th-century restored and maintained Dutch windmill. And yes, it still functions as a windmill, although it pumps water rather than grinding grain.
Roel (the caretaker) is also a great person and a fantastic host, and he and his lovely cat, Panther, make for good company. He makes a nice breakfast and is always available for help. The place isn't exactly in the city center (which would be tough for a windmill in a pastoral setting), but if you don't mind a 30-minute tram ride, it's actually not far from the popular sites in the city.