Awesome spacious place. It can easily host 4 people. Very clean, and with a superprofessional host that will be always available for you. Fabrizio is one of the best hosts i've ever met!
If i had to nitpick i would say the area of the apt isn't very posh but never felt unsafe there and most importantly it's super close to both the Metro and train stations (5' walk) making it very easy to go and see everything and even easier to go to the airport.
You won't regret it.