My fiance and I stayed here for nine days and really liked it for the most part. We think of an Airbnb as simply a place to sleep and put your stuff, and this fit the bill.
Pros: Good value for the money; the park (Buttes Charmont) across the street was perhaps my favorite thing in Paris -- seriously, it's amazing; it's close to the metro and easy to get into the center of Paris (we ended up using a metro stop about a 7-min walk away more than the one right on the corner, but still close); it's got a more local-Parisian vibe with no tourists around (it's fun to pretend you really live in a place); small but thoughtfully laid out, with enough space to sit somewhere other than the bed, a closet area to put your stuff away, a surprisingly comfy bed (it's a futon, but a nice one), and a simple kitchen with everything you need. There are some bakeries, shops, and cafes within a 10-min walking radius.
Cons: Not the quietest or the most private. It's on the ground floor right next to the mailboxes for the building, and the walls are thin, so when there are people coming and going you can hear everything -- and conversely, they can probably hear you. I always wear earplugs to sleep and I had no trouble at night when there was less activity, but trying to nap during the day was a mixed bag as far as people making noise out in the courtyard, etc.
Overall, a totally fine place to stay while we explored Paris, especially for the price. And seriously -- spend some time in Buttes Charmont!