I stayed for a week. Overall the apartment is a nice decent size and well decorated. The location is central to many shops and restaurants. Train stations are in close walking distance and the location as very accessible to explore the rest of Paris.
Unfortunately there was a small plumbing leak in the kitchen when I arrived. A constant dripping pipe which forced me to turn off the water main. Julien tried to organise a plumber to come but was unable to make anything happen till the day before I left. So I was having to constantly turn the water main on and off to get water in the apartment. It was a manageable problem, but not ideal.
Plumbing issue aside, I would probably come back here. The apartment was overall still very nice.