Jean-Luc's place is exactly as pictured. Plenty of space, good light, and has everything I needed.
Jean-Luc explained everything well, and left post-it notes around the apartment to help explain things that may have been less clear. Check-in was easy. He was at the apartment well before agreed meeting time and was very helpful.
The apartment is on the 2nd floor. There are stairs and also a small elevator.
Do note that you'll probably want to take the Metro to most of the usual places to visit in Paris. The walk to most, other than Sacre Coeur, would be fairly far. People on the street outside can also be loud at times during the day, but at night I didn't hear anything. And the bedroom faces the courtyard anyway.