Flats are very well located, in Trastevere but away from the noise and very close to public transport. Very clean - housekeeper does a great job and the owners have gone out of their way with the decor which is well thought out. Kitchen was very well equipped for making meals.
Communication was by phone and response was fast.
However, for families with young kids, take note that for the 2 b/room suite (if you take this option advertised on airbnb), the 2 b/rooms are not the classic interconnecting rooms but rather 2 totally separate flats. Perfect for older kids, less so for younger ones.