We had a perfect stay at Stephanie's beautiful apartment. The place itself was tidy and charming and it instantly felt like home. We wished that we had more time to just relax in the flat! But the best part of the place was the location of the apartment. Just up the street is a bustling corner with bistros, restaurants, and cafes and we were able to visit a good number of them. We especially loved the Moroccan restaurant, Le Petit Bleu. Of course, it's also very close to the lovely Sacre Coeur and the rest of the pleasant Montmartre neighborhood. Finally, we were impressed by just how close the Chateau Rouge metro stop was - it made our travels around town super easy.
In addition to the great place, communicating with Stephanie was excellent! She made it very easy for us and check-in was easy.
The only thing I will note is that it is a 4th floor (for us Americans we'd probably call it a 5th floor) walk-up, which was clear from the information provided, but is worth highlighting in case mobility is an issue for a future guest.