The double appartment of Gianluca is a great place to stay. Quiet surroundings, a lot of living space, airconditioning on the third floor and a nice balcony on the fourth floor to stay in the late afternoon and evening.
Supermarket close by, as well as restaurants and Italian ice cream (check Tripadvisor for quality scores before stepping into one of the restaurants!). Location of the appartment is very central to see the city. The Vatican is only a stone throw away and most other sightseeing locations are walking distance as well. If it is too hot to walk, walk to the metro (8 minutes) and take the metro to the Colosseum, the Spanish steps etc.
Looking forward to return!