For my research I traveled from the US and stayed with Jean-Baptiste for the whole month of June 2021. It was a very pleasant stay. The apartment is ideally located in the proximity of the national library, and more generally within walking distance to lots of things (parks, supermarkets, bakeries, cafes, restaurants). The apartment is situated a hundred yards away from a metro station. There is also a fresh market every Wednesday and Saturday across the street under the aerial metro line. You can't beat that!
The room is spacious and comfortable. It faces a courtyard. This means it is quieter than Parisian apartments facing avenues. Amenities are shared and it was totally fine.
Jean-Baptiste is a kind and well-organized host. From arrival to departure he made sure I had everything I needed.
At the same time, JB was respectful of my privacy when I needed it. The room was really mine during the whole duration of the stay.
I definitely recommend this place.