Two friends and I stayed at Cédric's apartment for a couple of nights on our visit to Paris. The flat was very clean, warm and beautifully furnished. As we were three individuals, we had a room and a bathroom each, with one of us staying on the fold-out sofa-bed. Cédric provided us with all necessary information about keys and rules in a timely manner.
The location is excellent in terms of walking distance to many of Paris' most famous buildings and places, however it can get a little noisy from outside due to the proximity of bars and vibrant nightlife. PLEASE NOTE: It has a number of adult shops and "adult entertainment" workers along the street (and sometimes in the hallway of the building). The character of the hallway and common stair of the building is very different from that of the flat itself. The occasional presence of the Ladies of the Night at the entrance was never a problem for us and we did not feel at all unsecure or threatened in any way.
I would thoroughly recommend this flat to groups of friends, but would suggest it is not suitable for families with children.