Michel's apt at Notre Dame is in a great location, a terrific size and has everything you need for a comfortable stay. Michel is very helpful and responsive though we had no reason to contact during our stay. The apt windows look directly at Notre Dame cathedral and is in walking distance to a lot of sites. From the Arc de Triomphe on Champs-Élysées , we walked back to the apt after the new years fireworks (as the metro would have been crazy busy) which took us 1 hour at a very brisk pace. My only observation would be that being as historical as the building is, lugging heavy 20+ kilo luggage up the narrow stairs to and from the elevator may be a challenge for some visitors.