I stayed at Pauls place with my partner for 4 nights. It was convenient for being 10min walking to the Monte Martre area (which is beautiful). We found the apartment to have a good cost/benefit for us, but if you are considering booking the place, you should be aware that at night it is a quite busy street, with bars and cars, and people talking all the time. Since it was warm at night, we tried to open the windows to air a bit, but the noise was super loud. Also, be aware of the region... some funny characters around at night time. Maybe avoid walking around late at night, especially if you look like tourists. It is a quite central region. And like most city centres around the world it can look rough at times. We did not have any troubles at all and I don't think you will. Just be aware. Also, we rented scooters to go around and we accidentally went in the opposite direction from Monte Martre (towards the train station) and I would say: Avoid it. It was super crowded. We felt unsafe. It was super dirty and funny characters looking at you (as if, you should not be there at all).
On a positive note, we loved the fact that we were super close to the Metro station (lines 4 and 12) which easily got us around all over Paris (And Disney Land).
There are supermarkets, restaurants and bars around the place (super easy). The shower in the apartment is incredibly good - nice water pressure. Be aware of the size of the shower area, it is quite small.
all in all, we loved our stay. We'd say a 7 out of 10.
Thanks Paul! :)