We had an amazing stay here; everything was clean, all that's needed was supplied (even Type C/G adapters, which we unfortunately forgot to bring) and more - I, for one, didn't expect to find a fridge stocked with drinks and a bathroom with plenty of shampoo and soap. Anna Maria is perfectly sweet and helpful, the room is very quiet and the ground floor gets a lot of light through the tall windows (the "balcony" with the bed on it does stay a lot darker, but that might be considered a convenience). We didn't find it to be a hassle or awkward to share a hallway with Anna Maria and her husband, it was actually very convenient when we had questions.
All major sights are within a very manageable walk along stunningly beautiful routes around the old town center - you'll trip over a less well-known sight every few meters, be it a small fountain, some minor ruins, a public courtyard of an old palazzo or a quiet square. Or, of course, a church.
The colosseum is a ~20 min walk away, you can reach the vatican within 30 mins by foot and many other big attractions are also well within a 10-20 min radius. Piazza del Popolo and Pincio take a bit longer - but if you combine them with the Piazza di Spagna and other things along the way, it'll seem a lot shorter. Our feet hurt every night, but we didn't regret avoiding the cramped busses.
We're very glad we found this room and hope to come again :)