I stayed at Andrea's place for two months. Perfect location to do and see so many things. If you do a long term stay make sure you consider an apartment with a bigger than a dorm fridge, or you may be shopping for food every three days. Andrea manages 8 or 10 of them in that building.
August was hot, even at night, and that AC unit in the hallway above the front door doesn't seem to do a whole lot unless you stand in the vicinity of it. There is a fan in the living room that I had on all day and that was helpful. You can't really keep the windows open at night because of mosquitoes in the evening / night time....at least I got bit bunch of times when I tried. Not a problem during the day. There are no window screens... they're not a Roman thing.
The Collosium neighborhood is a busy area specifically on weekends when you can occasionally hear people partying in the streets til 2 or 3 am. Aside from a couple of weekend nights it wasn't a problem for me.
I met Andrea only by chance in my second month of stay there even though he lived one floor up. However he was always responsive to any message of request and super helpful. I for one appreciated the hands off relationship. It requires a lot of energy to logistically manage so many units in the building. He seems to do it with ease
I can't recommend this place enough for all it's conveniences. I told my friends that the apartment is so close to the Coloseum that I had to buy a ticket everytime just to be able to get out. One actually believed me.
Read his recommendations for neighborhood restaurants. I enjoyed the wine bar ( great pasta / pizza / cold draught beer) across the street and Historia Clementine a block away. There is a gym a street up but it was closed due to COVID.
Enjoy your stay !