The location of the flat is wonderful on a side street on the third floor and nice and bright. The couch is comfortable and there is everything you need for a stay im Paris.
There seems to be a meeting place on the ground floor which sometimes plays loud music and during one evening it was impossible to sleep until late at night. For us it was ok because we didn't go to bed that early. If the bed is used in the living room, the fridge is also very noisy.
If you want some privacy I wouldn't recommend the apartment. The bathroom can only be closed with a sliding door and all noises can be heard throughout the apartment. No problem for couples, unfortunately a bit uncomfortable for us. I just think it's good to know before booking the appartement.