Federico and Irina's house was clean, comfortable and spacious. Irina's friend Naomi who gave us the keys was very friendly. S. Giovanni metro station was about 300 m from the house so you can use metro easily to go everywhere. We stayed 3 days as 6 people and during this time we just had to be careful about the hot water because there was only one electric thermosiphon.
ps. Irına helped us about transfering to the airport