Apartment: excellent, we loved it very much. It is a very comfortable and very efficient place with every amenity you need. We cooked, washed laundry and enjoyed the view from the windows of a very typical Parisian apartment buildings and homes. We have a 1 year old baby and this cute apartment was especially great for a small family like ours. Jeanne had arranged for someone to hand us the keys as she was vacationing, and that person spoke English, was kind and courteous. Jeanne also left us maps/brochures of Paris public transportation etc., which were extremely helpful. Building has 3 tiny elevators, is clean and quiet.
Neighborhood: safe but just ok. It is very ethnic and diverse, predominately with France's immigrant/minority communities. We didn't mind that because we lived in Paris before and know the city. However, we wouldn't recommend this neighborhood for someone who's visiting Paris for the first time. To see the classical Paris, we would highly recommend St. Germain des Prés for example. A big plus in this neighborhood was the fact that the metro station was right by the building, supermarket, bakeries across the street, lots of restaurants in the neighborhood (again mostly ethnic, which we loved). I would love to come back to this apartment, especially for the price we paid in August, but we would choose a different neighborhood.