This apartment is in the perfect location to see all the best parts of Paris. I have been to Paris 6 times and this was the best location I have managed to get. If you are out of shape or struggle with stairs or ladders I would avoid this apartment though. There is no elevator in the building and I counted 107 steps to the top. You also have to climb a small ladder to get to the bed in the apartment.
The hosts are very responsive and checked in with me to see how the stay was going. You can count on them to help you out if you need it.
Our stay was at the end of France's most popular tourist season and I think the Air B&B needed a little attention. It was not dirty but I wouldn't say it was clean either. There are cleaning supplies though if you feel so inclined or make a mess yourself.