Luis's place is nothing short of amazing, the location is superb to get to anywhere around Paris and the apartment is overlooking a 17th century church. The place was super clean and very stylishly furnished and I really enjoyed the wine they left me. If you want to feel like you live in Paris this is the place to stay!
I'll echo what others have said about the stairs. I found them to be charming and got a bit of deadlift practice with my luggage on the way up and down but just be wary.