We loved our stay at Daan's houseboat and would stay again.
The houseboat is centrally located and very near a metro stop and a lot of things to do. During the day, the water is quite lively and you can watch the boats go by from the deck. At night, it is very quiet and easy to get a good night's sleep.
Inside, it's small but there was enough room for our family (2 adults, 2 teenagers). The kitchen is decently equipped and we were able to make breakfast and tea each day without problem. Things (such as the refrigerator) are strangely located due to the space limitations of the houseboat, but you get used to it in a day or so. You have to be a bit agile to get inside due to the steep stairs but that wasn't an issue for us. The wifi worked well. The beds are firm and comfortable and there is a small living area to relax in. The bathroom is adequate.
Overall, we had a very nice stay and I would stay there again.