This was our family's first experience with airbnb and we couldn't have been happier. My family (husband, me and kids ages 9, 9 and 11) were very comfortable. The beds were so comfortable, location off a main square was quiet but perfect. Just close enough to main tourist sites but far enough away that we felt we were in a quieter neighborhood.
Note that many Italian apartments don't have dryers so you'll need to hang clothes to dry if you need to do laundry during your stay. Check-in was seemless with Simone (10 minutes max). He showed us where everything was, how to use the keys, where to go for dinner and they he left us to it, which we appreciated.
Thanks for a wonderful stay!