Awesome place!
Location is everything, a 15 minutes walk takes you to so many places!
If you walk north: Trevi fountain, Pantheon, etc.
If you walk south: the colosseum, Roman forum etc.
East: Termini train station
West: the amazing Vittoriano!
It's truly in the middle of most stuff, the only place that's "Far away" is Vatican city but then it's about a 30 minute walk so it's still doable.
As for the apartment, it was very spacious! Had a full kitchen, decent view, a good bed and two little cats that visit you when you open one of the windows.
Neighbors are not too noisy, maybe on some weekends you can hear stuff from outside when they play music or there's people talking, but really not that much
Literally the only downside for me is that it's on the fifth floor with no elevator, but of course I knew that going in. Carrying my 22 Kg luggage was not fun, so definitely take Ari's advice and don't bring too much stu