We were in Jean Michel's apartament for 2 days. We didn't meet him in person but his son gave us keys for the apartament. We arrived in Paris around 9 AM and Jean Michel let us come and leave our luggage at that hour, we didn't have to wait until real check in so this was really nice and we apprieciated it a lot!
Apartament is situated in a very good location, we went on foot to Montmarte and also Opera area. About 1 min walk there is a metro station so it was really easy and comfortable to visit the city.
Totally reccomend it! :)