We had a wonderful time in the le Nid de Cotte. It's a tiny apartment - but big enough for some days to explore Paris. It surely fits best for two people, but even we three - mother with two teenagers - were happy. The area is great - surrounded by nice cafes and bistros, don't miss the Boulangerie Julien or Le Baron Rouge. The market in front of the apartment on Sundays is amazing. And many touristic attractions are pretty close.
Getting in contact with Benmoine was easy and pleasant.