I don't have much to add to the very positive reviews for this apartment. What I appreciated the most was that Marc has a very professional way of dealing with it, so that I knew I was not going to run any issues that would not be resolved.
I was also surprised that I was not cold in the apartment (november): Paris apartments can be quite poorly insulated and I did not have to use the heater once (the apartment is small which probably helped in keeping the warmth, and I shut the kitchen and bathroom door at night to keep the cold out.
All I can say is that all the reviews are right: this is a great apartment.