Perfect location if you want to spend some extra time in Mortmarte and quick stairs up to Sacre Coeur. Close to several metro stops, we found line 4 to Chateau Rouge to be the shortest walk from the apartment. Apartment is bigger and much nicer than it appears in the pics - nice interior, comfortable bed, well equipped kitchen and great bathroom. We happened to stay here during some really hot days in Paris and a fan could have been helpful for better sleep, but probably not a big problem in lower temperatures. Expect a little noise from the streets around at night if windows are open, there are some cafés and restaurants nearby, but I'm sure you would experience this from any apartment in the city. Ear plugs helped :)
Everything else was great, very accommodating host that let us leave our luggage after check-out so we could enjoy our last day! :)