Everything was good for us. Agostino provided all the information on how to get there from airport, and showed the rooms. Fantastically good location for discovering historical city center - San Angelo is just a 100m away, Vatican is also close, Piazza Venezia in 15min walk together with Colosseum, post office on the corner, Piazza Navona in 10m walk (many places to eat and drink while walking).
Bus to Termini goes there and back again (I would recommend Corso Vittorio Emanuele- Chiesa Nuova bus stop, not the one close to the place, as bus 64 is not reliable, but nr 40 is ok). Supermarkets and minimarkets are all along the street, and some good grab-a-slice pizza places (Pizza Vip is my favourite).
As for apartment, a) bathroom is in bedroom, so have to walk through if you are in living room b) place itself is near a lively street, so if you like to sleep till 12, you need earplugs :). Luckily for us it was not a problem. c) garbage collector takes garbage from ground floor early in the morning, and last two days he called into our apartment to ask about opening the door, unfortunately I was not able to switch intercom off.
There is air conditioner, but I never turned it on. Internet (3G dongle) is pretty good, but I have a feeling that vodafone replaces some http pages with ads, had to turn on google data saving to force https. Kitchen has all the stuff, and bathroom is big. There is a small elevator in the house.

Hint: to get the hot water, you need to switch on the boiler behind bathroom door.

Thank you for pleasant stay!