We had a great experience with Jean and this house for a week. We were a family of 7 (my wife and I, three kids ages 10,9 and 5, plus my mother and mother-in-law). As you can imagine it was important to accommodate everyone's personal space, and the house was perfect for that purpose. The pictures are accurate, everything was clean, and for the most part all the appliances, etc worked well. Jean went our of his way to be helpful in booking some local services we requested such as a housecleaner and a car to and from the airport.
The neighborhood is fine -- on a quiet side street near Sacre-Coeur. It's not in the heart of the sites one is likely to want to visit, but convenient to three metro lines which made getting too and fro not a problem (which is notable with a 5 year old and two grandmothers in tow). It's an interesting mix of somewhat hipsterish influence and very touristy parts as well.
The bottom line is that across the entire party of 7 travelers we had a wide range of travel experience and appetite for adventure, and everyone ended the trip feeling like this house was a great choice for us.