Overall the location is central to a lot of places and close to the metro. The apartment is very compact, but for one person will do fine. I knew it was on the top floor with no elevator, thought that would be fine for my active self, but when it came to walking around all day, a six floor climb is not very pleasant after all. It has no AC, but plenty of fans, again I thought that would be fine, but Paris is summer...it was a bit miserable :( I understand this is not the hosts fault, but after staying, I don't think I would choose this place again. Mainly because the shower curtain was held up by two corners and kept falling, was dirty, along with hairs all over the shower floor...makes you feel clean! The main floor clearly wasn't swept, and some easy to have amenities were missing...like a bath mat, hand towel, trash big or bags.....
Just trying to be honest and share my experience and thoughts, but there are probably better places to make your trip to Paris nice and comfy.