My partner and I stayed at Pascal's for two months in the winter while we were working in Meudon. The location was excellent for traveling to Meudon, and anywhere else in Paris, as it is just a few blocks away from Gare Montparnasse, which has stops for the Transilien train line and several metro lines. It is also a very short walk from a large supermarket, several boulangeries, and many nice restaurants. The apartment faces away from the street, so there are few street noises. The building itself was fairly quiet; we hardly ever heard sounds from the neighbors.
The unit is on the 5th floor, but there is an elevator. The apartment itself was a good size for two people. The bed is roughly a US queen size. There is a combo washer/dryer, as well as a full size shower. The bathtub has a fairly high ledge, so people with mobility issues may have a hard time using the shower. There is a pretty well-stocked kitchen and a dishwasher.
Pascal was very communicative with us. We had one plumbing issue that required having a plumber visit the unit, but Pascal took care of all the details for us.