The location of the appartment is great! Very easy to reach all major tourist sites and near Marais, a nice neighbourhood. Nice restaurants and supermarket nearby. Despite the central location, the room is very quiet. The bed is really comfortable and there is a comfortable couch.
Some negatives: The ceiling is very low, which gives the apparment a bit of a cramped atmosphere. We bumped our heads a few times on the wooden beam in the middle of the room (around 1,60m height). The building is quite old, which in itself is nice and quaint. However, the room itself had a bit of a run-down feel, in particular the bathroom did not look so clean. The drainage is not so good apparently, so one is not allowed to throw soiled toiletpaper in the toilet, which may become a bit uncomfortable during a longer stay. During our stay temperatures reached 30 degrees Celcius, and it was really hot inside the room.
All in all, nice appartment for a short stay at a reasonable price at a prime location.