Very satisfied with our stay! Location was excellent, walking distance to most of the main Paris attractions, and to the metro/rer for those that weren't. The courtyard (mentioned by many earlier reviewers) was clean, no issues there anymore. Loved having a washer and dryer (note, the private washer/dryer are outside the apartment, in a room a half floor down). The apartment itself was quiet. My 17 year old daughter slept on the sofa bed, and it was very comfortable. I thought the bed in the bedroom was a bit too firm, but that's subjective...and I got used to it by the end of our stay. Would absolutely recommend choosing this place for your vacation.
Just a few tips I thought I'd pass along: To enter the door off the street, type in the code, then push the center of the door inward (with a little extra force). Thankfully a nice employee from the ramen restaurant next door saw us struggling and showed us how it worked. Also, in the stairwell, there are light switches, but we were hesitant to press them at first because they sort of looked like old American doorbells, and we didn't want to disturb anyone if we were wrong! But rest assured, they are light switches, so press away!