We have stayed 3 days at the Boathouse in November.
Our first impression was that it was smaller than in the site pictures. This is certainly due to the fact that the bed was changed.
The room was clean. The bathroom has no window and is exactly as the pictures. Should you stay there be aware that you will really listen to all the noises that Karin's familly are doing in their kitchen which is exactly above the rented room, starting at approx 8AM. This is the negative point. The positive point is the location, in the real center of Amsterdam, you will be able to do all by foot or using the 2 bicycles that are also coming with the appartment.
Karin & her husband are really nice and will help you if needed.