We really enjoyed our stay in Fabrice's apartment. It was clean, well equiped and nicly furnished. There was everything we needed plus good coffee :) The host was very kind and helpful, gave us directions and was ready to answer all questions during the trip. Although the neighbourhood seemed quite unsafe, I would say that location was really good, especialy when it comes to public transport (metro station across the street). Sacre coeur is around the corner, you can walk to Montmart in 5min, and go by metro to any other place in Paris in 15-30min.