This apartment was great in a fantastic location that is almost literally at Colosseum's door. Once of the best features was the bed - big, comfy and with new sheets. The place was also well decorated - you can tell it was professionally done. The art was very nice. The only drawback is that it was small so it wouldn't work for more than a week's stay in my opinion. Although we didn't meet Federico, he always responded quickly to messages and was very polite.
Highly recommended overall!