We arrived in Paris at midnight and Francois, who was away for a concert, arranged everything to provide us the key of his flat. Unfortunately we didn't have the chance to meet him until our departure, but he was very kind to help us with the wi-fi connection.
The flat is very close to the Arc du Triomphe (5 mins by feet) and the undergroung (2 mins to Ternes, 5 to Charles de Gaulle - Etoile). It is nice and clean, well furnished and situated in a neighborhood full of shops and brasserie. Paris is very expensive and a few supermarkets are close to home and very helpful to save some money.
I definitely suggest Francois and his flat for your trip to Paris!