The apartment has a lovely, cosy feel to it and we were very comfortable and happy with our stay. It's private, safe, clean and has everything you would want for a short stay in Paris. It was lovely seeing the Sacre Coeur from the kitchen window and watching it change colour depending on the sunlight.
Sara was beyond fabulous. We booked with very little notice and she not only accommodated our booking but also let us check in early. She bought breakfast every morning and even made a restaurant reservation for us. She's simply wonderful.
In my opinion (and it's obviously a matter of personal preference and budget) the area itself is not the best spot in Paris. It's not central or pretty but having said that the subway is cheap and easy to navigate. By all accounts the area is safe and we certainly didn't have any problems but I wouldn't have felt comfortable there without my husband.