This houseboat in Amsterdam's Westerdok is a unique and charming space in a great location. However, the treatment we received from the host (or, actually, her friend) soured the experience.
When we arrived in Amsterdam, we were not allowed to check in or even drop off our luggage until an hour after the listed check-in time, and there was no flexibility whatsoever. The host's friend knew that we were sitting outside for hours on a sweltering day, but remained absolutely rigid. Further, she chastised us at checkout for not taking out the kitchen garbage or unloading the dishwasher. My wife and I cleaned the boat to more than a reasonable degree, and we had to pay an extra cleaning fee at booking! Hence, my dismay at our treatment by the host's proxy.
On a positive note, the houseboat is pretty wonderful. It's enormous, with a full living room, small dining area, kitchen, bedroom, bathroom, and office (This makes one wonder about the strict rule that no more than two people can ever be on the boat at the same time). The entire boat is also loaded with hidden compartments and storage; a lifetime's worth of bric-a-brac gives the boat plenty of charm. The location is also great--within walking distance of the city center, but away from the busiest parts of the city.