As many other guests have already commented, the keys were at a remote location. We didn't think this would be a problem. We were supposed to arrive by 11pm, but when our flight got delayed by an hour, we had to reference the check-in instructions that simply said to call a number if you were arriving past midnight as the pick-up location closed at that time. We called the number 30 minutes before boarding the flight, just to hear that there was no one available to give us the keys, and therefore, we would not be able to stay in the apartment for that night. After going back and forth with them, scrambling for solutions we ended up at a terrible airport hotel for that night and could only check in to this place the next day after 10.30am. Thankfully we were refunded for this night. Sadly however, there were many other issues that kept on making the stay quite unpleasant.
First, the place was not clean. There were dirty towels piled up in the laundry closet, the floors were dirty - there was dust and hairs all over the place, both in the bedrooms and living room- and a sewage scent emanated from the bathroom throughout the whole stay. They also did not provide any trash bags.
Second, the place is not furnished as the currently posted pictures make it seem. The bed the open room did not have a bedframe, it was simply a mattress on the ground. This made it really uncomfortable as our heads were lying very close to the dirty floors. The living room table and couch are not the ones from the pictures and they are very uncomfortable to use. The bean bags were missing, so for four people to hang out, two had to sit on the (dirty) floor.
Third, the AC was on the whole time and there was no way to turn it off. The control for the AC was missing and even after we got on a chair to reach it manually, it could not be turned off that way. The weather was cold and even rainy outside so opening the window did not help make the place warmer. I actually got a sore throat from this and still recovering. Finally, the water did not last warm for more than two people showering consecutively.
Overall, we had a nice stay in Paris while we were outside of the apartment, but going back to it always made us feel uncomfortable and unwelcome, as it was not apt to make us rest or to enjoy.