Flat was great. Lovely decor, clean, quiet. Easy to sort out logistics like check in and check out times via email. (Owners are in the same building but we didn't end up meeting.)
It's not in the centre of historical Rome, so you take a bus or tram to get to the sights. We preferred that - it was nice to go somewhere quieter in the evenings. (Tram or bus took 5-10 min.)