Absolutely the best Airbnb I have ever stayed in. My family and I travelled from Barcelona to Rome, staying in Airbnb apartments on almost every stop, and this was definitely the nicest out of all of them. The location is amazing (just a few steps from Trevi Fountain), the terrace is a dream, and every inch of the apartment was immaculate. It also has the best air-conditioning of any apartment I've stayed at in Italy (which is very important in Rome in the summer...).
Just as important, Sara was the most responsive and helpful host we rented from. Her husband even took a drive with me in my car to help me find parking (which I never would have been able to do without his help). Truly a notch above everything else we'e seen on Airbnb. I highly recommend this place to anyone looking for a luxurious, spacious, centrally located apartment in Rome.