Nathalie was a very nice host. My flight was delayed two hours so she had to wait for me, but she was very nice about it! The place is very cutely decorated and the location was not too far from the things we wanted to see(30-45 min by metro). We had a bit of a scare our first night, coming back to the apartment at 1AM and so we took care to make sure we weren't back too late the rest of the nights, there are many supermarkets and bars/cafes nearby. The only thing, for those who want to prepare their own food, is that the kitchen is small and some of the things we needed weren't there and it wouldn't have made sense to buy it when we were only stayi for a few days.
But in conclusion, everything was great! Nathalie was always available to constant. And the 4 flights of stairs aren't as bad as it sounds! Thanks!