The neighborhood is nice. It has a park and plenty of grocery stores, restaurants and bars, but it is a bit noisy at night.
For transportation, there is a bus to the city center but you never know when it will or won't show up. Otherwise the Termini train station is at a 15mn walking distance, and since walking is also a great way to discover the city we walked most everywhere (35mn to Colosseum for example).

Upon arrival, we got the keys from a very nice lady in the lobby, who only spoke Italian. We never saw or heard from Claudia.
The apartment is in a quiet building, but there was construction going on right outside the apartment door and it woke us up on several mornings. We had not been warned by Claudia.
The apartment was small but very clean, had everything as advertised, and the wifi works well. However it was so hot at night that we couldn't sleep in the "upstairs" bed and had to sleep on the sofa bed, in the same room where the air conditioning was. The air conditioning was very very noisy, but we had no choice but to use it in the heat.
But the main problem was with the bathroom : there was an awful sewage smell every time we used the shower or the toilets.

Overwall, we still enjoyed our stay but might not consider rent the flat again because of the problems mentioned.