Me and my friend had a lovely stay at Beauquartier at the end of November. The apartment was clean and tidy when we arrived, and we had no issues with self check in. The location was really good - whether you wanted to walk or to use public transportation. And there are a few restaurants in the area! We arrived when it started to get really cold outside but the aircon worked smoothly so it was nice and warm inside. I think something to bear in mind is that apartment is quite dark - even after uncovering the windows in the early afternoon it felt dark. It wasn't an issue for us as we spent most of time outside, but this is a tip for those who would want to stay there for longer. It was also quite loud outside on Friday night till late - but that's the charm of staying in an exciting area of Paris!
Overall - great stay and I recommend it!