It was fun staying there. Really felt like I had the "Parisian" experience. The room is modern, so I expected it to be in a contemporary apartment building. When I got there however, it was a nice surprise that it was located in a very old building. It's located in the roof level, the 6th floor, and from it you have a partial view of the Effeil tower.
The bathroom is located outside of the room, but I never saw anyone else in the corridors. So it didn't feel like a shared bathroom.
It's in a beautiful location, very convenient to all the attractions and close to the metro. I stayed for 4 nights and would go back.