Really liked Alessandro's place high atop the central shopping district and across from the Opera house.
Place is clean, spacious and functional. Alessandro is very responsive in communication. Stefano, the complex manager is very helpful (be sure to brush up some on your Italian to communicate in depth. I spoke to him in Spanish and we were able to manage)
Really liked your place. Stefano was very helpful. Interior parking is a great asset. Place is centrally located and in a safe neighborhood with lots of people about.
Areas I would suggest make the stay even better: warn people about the electrical limitations - one machine on at a time and the warning signal the electrical breaker makes prior to engaging. Give instructions on how to check all is safe and reset.
Also leave a little more of a guide the city. Basically tell people about very local spots you enjoy (and give them a quick description on why you enjoy them) so people can become initiated to the area and want to go out and explore after being exposed to your top choices.