Great Airbnb in a great location - being ON Piazza Santo Spirito. I thought it might be loud at night but the noise cancelling windows really helped with the sound. You could still hear the noise on weekends but it was more of a white noise and easy to fall asleep too. Otherwise very quite.
I was one of the first to stay in this Airbnb and so while there wasn't everything on arrival that I expected for a longer stay, the host was super super accommodating on bringing what I needed (extra blanket, towels). They were also willing to make reservations for us if needed.
My own suggestion is some more amenities upon arrival (maybe some converters - the apt has a mix of old and new Italian outlets) and something to keep the summer bugs at bay if you want to leave the windows open (but obviously not something that's the fault of the host!)
Would definitely stay here again next time I come to Italy!