What can I say about this place? Staying on the Seine in Paris? In a boat? It's a dream! Everyone you tell will be envious. You'll be in the heart of the city! And it will be an adventure you may never forget.
So why 4 stars? It feels like a lot of quality of life improvements to the boat given the cost of staying here. The bathroom door's lock is broken and could easily be fixed. A cabinet door pops off its hinges when you open it. The bedding options for the 5th person, if you have them, are really old blankets that had some... not good stains. It's such a wonderful place, I hope the owners will pour some love into it, because it is otherwise a magical place.