Everything was just fine. A little small for four people but you can make it work. Since there is only one window, and the apartment is in the Souterrain, there was almost no air. It was very hot in Paris during our stay which made the apartment even hotter. Also there is no window in the bathroom which makes it very damp in there.
All in all it was a clean apartment in a great location. Furthermore, the Check-In was very good explained, even if it was a little complicated. We would stay here again.