Marco's apartment is beautifully decorated as per the pictures on the 2d floor with a lift.Even if the kitchen/living is not very big, it's nice to have 3 separate bedrooms.2 of them are facing the street and it can be noisy in the morning, when the 3d one is on a courtyard so very quiet.The kitchen is great for few days but limited on what you can do (no oven). The air conditioner in every room works very well. It's only 10mn away from Termini station which is great as the bus from the airport arrives there. As any station around the world the neighborhood is not great but we didn't feel unsafe going to the flat.The street, where the apartment is, is quieter with a covered market right in front of the building and supermarket 10mn away . It's also 5mn away from Vittorio Emanuele subway station which is very convenient to visit the Vatican,the Spanish steps...and it's only 20mn walk to Colosseum and Roman Forum.
Marco was very quick to answer our questions via airbnb.
(If you want to let your suitcase in Termini station be aware that it takes a long time to be able to drop it, over 1h for us, on a sunday, except if you're ready to pay the double(fast drop off 12euros by luggage) but it was quick for pick up.)