I think the appartment is too small for 4 or more people.
There are so unecessary stuffs in this 35m2 and these things make the room even smaller. The sofa is covered by unusual traces, and smells is bizzare too.
I know this type of accomadation is not rare in Paris but the prix quality is not as good as these others in my opinion.
The host uses the 3rd servive to manage. It is only minimum and not reactive for one of our question before the trip.
Anyway, I do not think the price is fairly pricing (850e for 3 nights)