This apartment is a basement apartment, which keeps it cool but a little damp. We visited during the crazy heat wave of 2019, and as noted there is no AC in this apartment. This is not the fault of the host, as he clearly states that in his amenities. There are ceiling fans. The room is plenty big for a lone traveler, but I would not recommend this location for two travelers unless you reserve two of his rooms. That, again, was not the host's fault but our own.
LOCATION was phenomenal. You are an easy walk (2-3 small blocks) to metro and a longer but easy walk (20 minutes) to the train station that can connect you to Florence, Pisa, even Pompeii!
The Colosseum is an easy 15-20 minute mosey away.
SAFETY was never a concern. Our car stayed parked for 3 nights, 4 days and was fine! There are 3 keys needed to get into your room: front door to building, key to apartment, key to room. Well lit roads.
RECOMMEND this place without a doubt! Kind host that responds quickly and takes time out of his work day to come check you in. Only recommendation is to maybe avoid this place (or Rome in general) in the dead heat of June/ July!