The appartment can be reached easily via Metro line 12. It's a 20 min walk to the Eiffel Tower, and about 15 to 20 min by Metro to the city center. The appartment was nice, we were three persons and had enough space. There was a double bed in one bedroom and a single bed plus a bunk bed in a second bedroom, which is a kid's room. There was a couch in the living room. Everything was as described. There was a mobile air conditioning unit, which was nice to keep the appartment cold because the street is a bit noisy to keep the window open. So the air conditioning is a very good bonus.
The host was very friendly and helpful and easy to reach. The check-in worked perfectly and hassle-free, also the check-out (we were askes to simply leave the key on the kitchen table). There are a lot of restaurants nearby, if this is important, also bakeries and at least three grocery stores that we were aware of. Not a touristy part of the city, except for the area near the Eiffel Tower of course. We would recommend to stay at Guillaume's place.