First off: Clean, easy check-in and -out, excellent communication with host!
Now on to details:
The apartment can easily be reached by metro (Porte Clignancourt), however walking from the metro to the apartment at night time is rather sketchy as a single woman. If one walks home from Sacre Coeur or Montmartre: That walk seems perfectly fine! And the neighborhood in that direction is perfectly fine too with shops, market, bistros etc.
Sadly there was no comfortable seating in the apartment, only kitchen chairs. And after a day of walking, it would have been nice to sit down comfortably with one last glass of wine...
The mattress and bedding were comfortable, except for the pillows. They were quite bad. One was really flat, the other was only a little better. That might change though...Who knows.
So for a night's stay in Paris I would consider this apartment again.