Nicolas is a great host, very knowledgeable about Paris and specifically the excellent surrounding neighborhood. He is always available to lend a hand or a tip if you tell him what you are looking for.
The room is basic - bed, lamp, and a chair or two. The bathroom is spotless. Wifi is excellent. The apartment has a functional kitchen if you want to prep a meal or two. Worth noting the apartment is on the top floor of a Paris building so it has a slanted roof in some places, tall people may have trouble with hitting their head in the shower (I am 5'9"/175cm and it happened a couple of times).

Overall I enjoyed Nicolas' apartment, mostly for its excellent location.