The stay at Quentins place is 100% recommendable. We stayed there for three nights and had everything you can ask for - from the communication with X to the location...
Flat:
Even though the flat is in the fourth floor, you can use the elevator. The flat itself is big and clean. Our room was very warm (good heating system), had towels, guides, fast internet (router in the room) and the toilet was next to the room. The bed is very old but the mattress is in top condition. My companion used the available fan.
Communication:
Quentin answered within minutes and was already waiting for us to handover the keys. He gave us a lot of tips where to go and what to do. He is very welcoming and discrete.
Location:
Pere Lachaise is a very good location. You have a lot of restaurants and bars, the metro, supermarkets, bakeries and a sightseeing spot: the cemetery.