We were very satisfied with our stay! Kevin is a very polite and gracious host. He is very prompt to respond and even helped us figure out train tickets to the Normandy beaches.
Like the other comments, the stairs are a killer! In the end the apartment is worth the climb. Look at it this way, it helps burn off all of those croissants!
Also, this apartment is cleaner than most hotels that you would stay in. Thanks Kevin for such a wonderful time in Paris!