Olivier's flat was perfect for our family of four (husband, wife and two adult daughters).
Location: From the location we could walk everywhere, including Notre Dame, The Louve, The Eiffel Tower, The arc-de-triomphe and more. (Admittedly some of these were long walks, but we enjoyed that.) It is situated in a busy area that includes a pedestrian area. It is steps from an RER train station (easy peasy to get to Charles De-Gaul airport) and very close to several metro stations. The area is busy into the night with people, so I'm guessing in the summer it might be a bit noisy at night with the windows open, but we were there in late December and the noise was (mostly) very tolerable.
Host: Olivier was very communicative offering several suggestions for restaurants and answering several other email questions prior to our arrival (washer dryer? yes there is). He greeted us at the apartment upon our arrival, telling us were we could park our car temporarily while we unloaded. He helped us up to the apartment with our luggage and gave us a comprehensive tour of the flat. He has a custom local guide pamphlet he has put together which we found very helpful. He was also extremely helpful as we returned our rental car providing information over the phone to guide us through the incredibly dense Paris Christmas traffic around the Louvre.
The Flat: Very spacious for our group of 4 on the 2nd (3rd) floor of the well-kept building. There is one full bathroom, one with just a shower, and one with just a toilet. A nice large kitchen, dining room and living room were very comfortable. The two bedrooms were very nice and spacious as well, one had a queen bed, the other two singles.
All-in-all a highly recommended Airbnb property.