The place is nice and spacious and close to the Termini train station. And that's also its negative. During our stay (middle of August) there were many street shops right in front of the door, so there were constantly some people sitting right in front of the door, and it was somewhat noisy too. I could see that as a dealbreaker for a group of women for example, for whom it might not feel comfortable. During the night, even though the street shops were closed, there was still noise coming from the outside to the bedrooms (their windows were into the street and it felt like they had almost no sound isolation). I know this is out of host's capacity but still, needs to be stated.
During the later hours it can get really hot in the living room since there are no blinds or anything, and sun is shining directly into the room, heating it up. There ale some fans in the rooms that can make it better, but still it is really hot in there and you're probably better in the bedrooms. Some inner blinds that could block the sun would be a big help for that.
Apart from that, communication with the host was perfect, there was a guide with important information on the table and all the rooms (as well as all three bathrooms) were clean with pre-prepared towels.
One minor issue is with the keys. To get in, you need to open two doors and the outer one of them requiere key to open from the inside. We get two keys for the other door, but just one for the outer door. Meaning that if your group wanted to split, there was practically no way of doing that. But as I said, that is very minor issue.
Overall we enjoyed our stay as we were mostly away from the apartment and came in just for the evenings.