We had a great time in Rome - Daniele was very welcoming and helped organize transportation from the airport and back for us. He was also very straightforward in warning us at the time that there would be works on the building and scaffolding set up, and gave us to option to cancel or confirm booking at a discount.
The apartment is in very good condition, incredibly located and ideal to visit Rome. You can pretty much walk to almost every part of the historic city in less than 20 mn at most.
One note though - Since the apartment literally is on Piazza Navona, which is animated until late at night, this is not for people who like absolute peace and quiet. It is not noisy per se as it is on the top floor, but you can hear a bit of background music and voices coming from the piazza. Was not a problem for us but could be for guests wanting absolute silence...