Stayed for a month (May-June) and the apartment was perfect. No problems communicating with Maxime or his colleague Leo. Great location with cafes and other eateries right outside the front door. There are 3 bakeries within a 1-minute walk of the main door, a Carrefour grocery store, and a Nicolas liquor store. Our fav restaurant was Jacobine but there are so many good places in the area. Seemed like there was always a party with music on Rue de Buci which made for a fun atmosphere. The apartment is in the back of the building and very quiet, so you don't hear anything from the street. The bus stops, metro, and RER B are all close by. It's less than a 10-minute walk to the Louvre and 5 minutes to Jardin Luxembourg. If you are staying for a week or more, you should get the Navigo Weekly pass. Good on the RER B (CDG), Metro, and Bus.
The apartment has a small kitchen with everything you need. Also has a living room with a separate bedroom. Little things like umbrellas, a 2-wheel food cart, and an insulated carry bag were nice. The apartment is on the top floor, 92 steps, but not bad after your first trek up with your luggage.