Federico's was good.
Pros:
Amazing location - very close to the Colosseum and other tourist attractions as well. The neighbourhood has cute cafes and shops.
It was clean, check in was easy.
He was able to help me immediately when I had issues with opening the door.
Con:
The apartment has lots of iron furniture and they are all VERY rusty. This really bothered me. The sinks are super rusted and there was this weird smell that came in. I was not able to sleep well while I was there.