As a solo traveler I found this place to be perfect. It has two doors (with codes) before you get to the flat and a shared courtyard that is only for the apartments, very safe feeling. The interior was very clean and the room is better in person than the pictures would lead you to believe.
Dominique was a gracious hostess and we were able to communicate; her English better than my French.
Within a stone’s throw there are a cheese shop, wine store and bakery along with the metro which is right across the street. Couldn’t ask for a better located flat and the Belleville area was nice as well. I will certainly stay here if I visit Paris again.