This is exactly what you want an Airbnb experience to be. Andrea was good at communicating beforehand, and when we arrived not only was there a lovely, clean cozy flat but Elena who let us in had a bottle of cold white wine waiting. There was also coffee and a coffee maker (morning coffee on the balcony under the orange tree was a lovely way to start the day) as well as other kitchen stuff which we could have used to make meals at home if we hadn't been so tempted by all the neighbourhood restaurants. The effective air-conditioning was great for the hot summer days, and meant we could return home to relax after sightseeing during the day and before going out in the evenings.
Trastevere is a wonderful neighbourhood - great restaurants, nightlife, gelato etc. And a few minutes walk will get you to the tram or various buses (it's also a nice walk across the bridge to many of the sights of Rome). But it can be quite noisy, so the quietness of the street where the loft is located was a real bonus.
Our flight wasn't until the evening but Andrea and Elena were very accommodating about letting us store our luggage - and as a final touch Elena ordered a cab to get us to the airport.
I would definitely want to stay here again next time I'm in Rome.