Alessandro's place has a great location. Close to the colosseum and to Cavour metro station (like 5 min walk). There is a good supermarket nearby, and also great restaurants, bars, gelaterias, etc. The apartment is not big, so it might get too crowded for 4 people, but it was great for me and my mom for 3 days.
Alessandro is a great host. He was super helpful, gave us a lot of tips on how to get around, he also has a list of good restaurants and other places around Rome. He also offered to pick us up from the airport for a reasonable price (much better than being tricked by airport taxi drivers), which was super convenient for us, especially after a long trip. And helped us by booking a taxi for me to go back to the airport, since we were leaving super early.
I had a great experience, I highly recommend this place!