Although that's the sad reality of Paris, I must note that the flat is indeed very small. It also doesn't really have windows, because the door directly looks onto the courtyard, so getting some fresh air means sacrificing your privacy.
It's pretty, but everything seems to be made out of plastic and the space between the bed and the ceiling is a guaranteed bump with your head.
Additionally, when I arrived there was no hot water. The host was quite responsive in handling the issue, but, still, I was without hot water for a good 24 hours, which meant 2x cold showers. I got a discount in compensation, but I had to ask for it and I found it quite limited.
All this for a lot of money. For the same price, next time I'll go to an hotel.