Among the absolute best and most unique locations to stay in Amsterdam, a city I have spent about 40+ nights so far over numerous trips, and this accommodation was favorite. Not only close and convenient to anywhere you want to be, but just sitting on the top of the boat relaxing and watching the endless Amstel river scenes unfold is an experience by itself.
This is the second Amsterdam houseboat I have stayed in, and I will say this one is typical for amenities but way on top for the location.
Tips for you: know what to expect. It is tight quarters, not like a flat or hotel room, and you have to climb down into the berth just like the families that lived on these boats did. Everything is miniature expect the beds - they were full size and super comfortable slept great!
We had myself, my wife, and 13 year old daughter. We were very comfortable. I would say max 4 people to have a good time; couple with 2 kids or maybe 2 couples.
The hosts genuinely care about a positive experience, communicate constantly and quickly via WhatsApp or phone, no problems at all.
No hesitation on 5 stars, great time- again just set your expectations on the size and entry/exit and if you're good with that you will love it!