The location of 66 Avenue de Breteil is ideal in terms of proximity to major cultural icons (e.g. Les Invalides, Tour Eiffel, UNESCO, marché de l'Avenue de Saxe) and services (boucherie, boulangerie, patisserie, numerous after-hour neighborhood markets, cafes, etc.) as well as ready access to metro, bus stops and taxis. What we found especially endearing was the welcoming attitude of residents. Also, at no time did we feel any sense of unease walking in the neighborhood at extremely late hours at night.
This is a great place to spend some time in Paris.