We stayed for three months and it was not long enough. Maurice is a wonderful host and gentleman. The apartment was exactly what we were looking for, with an open floor plan, well equipped for a long or short stay, and terrace with a beautiful view of the city/skyline/Eiffel tower. It is on a wonderful street with literally everything we needed. Patisseries, cafes, fromagerie, wine stores, franprix, restaurants and more all within steps of the apartment. We loved going to the Marche Grenelle open air market twice a week for all of our produce needs and other shopping. It is only a short walk to the Seine and Champ de Mars.
Living in the 15th arrondissement for a few months is as close you can be to being Parisian without moving there permanently.
We loved our stay and already are wanting to return on our next visit to Paris.