We had a great time staying at Nicolas's apartment. Location is perfect to see everything in Paris - an easy walk to everything in St Germain des Pres, easy walk to Notre Dame, Ile de la Cite, Louvre, Musee D'Orsay, Invalides, etc. Used the velib service to bike to Eiffel Tower which was also very quick! Apartment is very clean and big. Only problem I could see anyone having (which wasn't a big deal at all) would be the many many stairs up to the apartment - not for elderly or anyone with leg issues :) Perfect for two people, if you have 3 - realize that sofa bed is in same room as the other bed.