We stayed at this apartment during the entire week of the heatwave in June of 2017. Instead of the June highs ranging from 65 to 80, it was almost 99 on the hottest day. Much of my experience is colored by this. There are a lot of big windows that you can open, but if you have to leave them open overnight, there is a lot of noise outside that can disturb sleep. I don't think it's as noticeable when the windows are closed. Beeping trucks and pressure washers start really early in the morning -- this is noticeable with the windows closed.
The place was large enough for our family of five adult-sized people to sleep and lounge. We thought that having only one toilet would be a problem, but it's separated from the two shower rooms so we didn't have any issues. The washrooms are superb. The showers had good pressure, felt good and we didn't run out of hot water.
There's many convenient things around: There are many close places to grab something to eat and a little grocery store down the block. Across the street there's a cash machine and a creperie that's open really late. Quatre Septembre underground station is next door and Opera is about a block and a half away.
I would definitely stay here again -- if it's under 75 degrees though.