Hello,
Please be sure to read hosts' review of the place, he is very honest and precise in his description of the apartment. It can only accommodate one person and be prepared to walk to the six floor, which can be no picnic at the end of a long day.
The apartment is perfect for a solo traveler and someone who doesn't mind to spend 50 min walking to the center of Paris. Everything was in working condition and I had no trouble with accommodation. I did have a bit of a problem with getting into the apartment though, however i think i was just too tired to think straight after the flight. The host provided very detailed instructions on how to get into the building and apartment. So just take your time to figure it out, it is pretty easy.
As far as neighborhood, I would say that I did not fill unsafe, but I advise always practice cautiousness. During the day the place gets very busy, there is a market near by and people will try to sell you stuff. but other than that I didn't encounter any issues.
So overall i was very pleased with the apartment and my trip. And would stay again at this accommodation.
Thank you