Xavier was away when we arrived, but he made sure that we had contact information with his housekeeper, and that worked out well.
The apartment was excellent, and though not air conditioned, on some hot days/nights it was up high enough to enjoy good breezes so we slept well. And, since the elevator worked well, we did not have to exhaust ourselves climbing to be up so high.
We did not cook, but made good use of his espresso machine, and the espresso capsules he left for us.
The location was also very convenient. We bought and used the Lyon Card, good for the subway, and museums.
I highly recommend use of Xavier's garage if you have a car.