The Apartment is very spacious and clean. We stayed there with 6 people for 6 nights. There ist one big bed and two big sofa beds, which easily fit for two people each. Unfortunately, they squeal when you move, some of us found it a little bit annoying, me personally it did not disturb.
Its pretty nice, that there ist air conditioning in the livingroom and the bedroom! Also the balcony is very nice to sit there in the morning or evening. The kitchen is nice and fully equipped, but we didn't use it (eating out in Rome ist just too good).
The bathroom is also big enough, the only thing that annoyed us it that there is no shower courtain so the room gets wet while showering. Also the water temperature is a little tricky to adjust, but after some days we got it.
The location was perfect for us, metro and bus ist near by and with metro to main station its only a few minutes. The bus to colosseum also takes just about ten minutes, perfect for sightseeing.