As indicated in the announcement there is no elevator and up to the fourth floor can be tiring but the price / quality ratio is excellent. There is a supermarket just below and many other in 100/200 m. Moreover, for people eating gluten free as me or bio there is a "special" bakery at 50 m from the apartment. In the zone there are different metro/RER/bus stations, the closest in 5 minutes. Marie and Michael have also asked more times during our stay if everything was fine and answered fast and kindly to any question.
I really suggest their apartment.