Salha was very responsive when we asked, and the location was perfect for us (ethnically diverse, lively, one block from lovely markets, near several metro routes). And yet the house was extremely quiet (no street noise at all).
How good of a fit it is for anyone depends on their needs. It is like a hotel room in that there is a bed for sleep after a long day of exploring, and a small table to eat at and maybe use a computer, but nowhere just to relax and read - not enough pillows to use the bed as a chair. It is important to have a flashlight as the hallways are dark at night.
Also, for those looking for the human connections that airbnb often offers, this is not the place, you are renting a room. But for those wanting a nice place to serve as a sleeping base in Paris, it is perfect.