Filippo's apartment is in a great location with some nice restaurants around. Il Clementini was amazing so you should definitely go there and Propaganda do some nice cocktails.
The Colosseum is literally at the end of the he road which is breathtaking when you leave the apartment in the morning.
The flat is nice and modern, however there is an issue with the water so make sure you ask relevant questions if more than one of you want a shower consecutively...
Also bear in mind the 45€ cleaning fee you have to leave in cash for the maid on the last day... which is very excessive and should be paid through Air BnB.
The biggest issue with the apartment was the persistent banging noises which started at about 2/3am and went on until past sunrise (8am). Sounded like people were opening and closing the metal dustbins outside ALL NIGHT. Me nor my mother could sleep even after a really tiring tourist filled day, so take earplugs/sleeping pills/stock up on alcohol at duty free... I'm not being dramatic, but it was pretty awful and I live in central London!
Otherwise it was a good base for the three days.
Thanks Filippo and Cate