Three main points:
1. Location - what is important, Fori Imperiali, Colosseum, places of interest are in walking distance. That means that literally you may just go for a light walk before going to bed and just "by the way" pass through Colosseum. Just great, feeling like citizen of Rome's centre. And very safe.
2. View - as on photos, even better. Especially in the morning when you wake up and look out of the window. Not only the Church, but other surrounding buildings are very beautiful.
3. Clean - I don't know what the owner does to keep it so clean, but it is extremely clean inside.
4. Bright - all the rooms and corridor - everything except the bathroom has windows which makes the apartment very bright.
Also good to mention - as we were here during not the warmest season - the heating in the bathroom makes getting out of hot shower very comfortable.
The house and apartment might have a rich history, though everything is in a very good shape and looks rather luxury than time-worn.
The drawbacks are minor, however worth mentioning:
1. Noise from outside traffic - during the week, the traffic is heavy, at night and early in the morning, so we had to sleep with windows closed and ear protection. Good to mention that after all day walking in the Rome I was so tired that I was sleeping like a baby and needed neither windows closed, nor the ear protection :)
2. There was no frying pan in the kitchen, and we were not able to launch microwave but it was not a big deal for us, and we didn't even ask to fix this.