Totally amazing!
I have traveled to smth like 30 countries, and this place may well be among very best stays I ever had. It is stylish, cozy, well-designed and equipped with truly necessary and well-fitting things that create special atmosphere - a log-burner, a radio with sound system mounted on the wall, some nice furniture, bookshelves. I mean, it is not luxury at all, but for me there is some magic in this place that makes you feel like home.
Also, I could hardly wish for a better location - it is not far from the city center, and at the same time you have a truly private space - 30 meters of water between you and people in the city. No neighbors behind the wall, no traffic noise, just the sound of waves and your own houseboat and pier. It is ideal for a couple's romantic weekend.
Finally, the host, Martin, is very quick-responding and helpful, I really appreciated that.
Strongly recommend to anyone going to Berlin as a tourist.
P.S.: I may only make a note that when booking this place, one should be realistic in his/her expectations from this place. I mean, do not expect it to have 5-star hotel amenities, and be mindful that getting to it and living in it demands some very basic skills - like handling a paddle-boat, binding it to the pier, making a fire in the log-burner, etc.
With realistic expectations, this place is truly unmatched in terms of value for money - and memorable experiences :)