We (a group of 4 people) stayed at Stephane's apartment for a week and had no complaints. The apartment is cozy and filled with great artwork, books and movies so it feels super homey. It was clean and had everything you would need for a nice stay (linens, towels, kitchen supplies). The beds and rooms in general were very comfortable, too.
Maria, the landlady, also helped us a lot by answering all of our questions since she stays most of her time in the building. The place is near 2 metro stations and lots of supermarkets and bakeries, so it's easy to get around.
The only kind of negative thing i would say about the apartment is that it gets kind of dark at night since there's not many ceiling lights, only some floor and table lamps, but it really wasn't that much of a big deal for us since there's lots of natural light during the day.
Would definitely come back!