We had an excellent stay at Richard and Birgit’s houseboat. It felt like an adventure to be on the water, but the boat had everything we needed. We were just 2 metro stops from Central station where we arrived, and getting around was very easy - a lot of attractions were within walking distance.
The steps down to the door from deck level are very steep - essentially a ladder - which won’t suit everyone, but I would recommend the houseboat to anyone for whom that isn’t a problem.