I stayed at Jean-Philippe and Denisa's place for three months during my business trip to Paris. Jean-Philippe and Denisa made it feel like home for me, for which I am very grateful! The place has all the amenities needed for longer stays. The communication with hosts was perfect - Jean-Philippe always responded to my messages withing the next 2 hours (at the latest).
There are plenty of supermarkets and restaurants and a big shopping mall with a cinema just in 1 or 2 walking minutes. The next two metro stations are in 2 walking minutes as well and take you directly to almost all the most important railway stations of Paris (Gare d'Austerlitz, Gare de l'Est, Gare de Lyon, Gare de Bercy, Gare Montparnasse, Gare du Nord). The area where the apartment is situated - Butte aux Cailles - is stunning and unique, even for Paris - which is already magnificent in itself. I enjoyed the atmosphere of Butte aux Cailles a lot.
To sum it up - great location, great hosts, and totally recommendable for longer trips to Paris!