We stayed a little over a week at this place and had a wonderful time!
The apartment itself is super cute. There are two floors (pretty rare in Paris); the top floor with the living room and open kitchen, the bottom floor with the bedroom and the bathroom. It's nicely decorated, and funnily enough pretty well isolated from the street (the street below is really busy, but inside the apartment, we don't hear it very much).
The neighborhood is great too. It's very working-class, with large African, South-Asian, and Middle-eastern populations. It's lively at all hours of the day until quite late.
In terms of transportation, it's pretty well connected. There's a subway station right down the building, but otherwise, it's a short walk to La Chapelle which is somewhat better connected.
If you want a Parisian experience that is slightly different from the postcards, this is the place to be!