The location is good, 5-10 mins walk to Vatican city. 5-10mins walk to the opposite direction will be the S. Pietro train station. It was quite convenient but you need to change to metro to go the city's attractions, which I got confused for the first 2 days.
Host was very nice, with his help, our stay in Italy was a lot smoother even though we had some miscommunication during check-in.
There is a small and cute elevator in the building but you still need to take a few steps.
Apartment is spacious, with well-equipped kitchen where we enjoyed a lot.
My only concern was the storage type water heater for shower. My husband and I needed to manage our shower time carefully or else the hot water might run out half the way when the second person was taking shower. The radiators provided and managed by the building were not operating during our stay as it was not yet in season. However, the room temperature was just fine.
Overall, I enjoyed my stay so much and hope to travel to Rome again.