OK let's start at the end, we are already planning when to go back to see Susy again.
This was our first trip to Rome and the instructions for the bus from the airport were great.
The apartment is close to the bus stop and easy to find.
It's located about half way between the Vatican and Termini station and within a reasonable walk (1 mile) of all the tourist hot spots.
The street has a car repair garage, a convenience store and a sprinkling of other uses. The entrance to the building is through two immense wooden doors into a cool lobby with an ancient elevator (read fantastic, it works well and is part of the fun of the place).
The apartment is at the corner of the building surrounded by offices either side, we heard no noise from neighbours during our stay. It's on the second floor, the floors above are mainly appartments.
Inside, Suzy shares my taste in music and is very welcoming. Her English is much better than my Italian.
The room and shower are great, spacious, comfortable and private. The kitchen and dining area are for breakfast only, but this does not pose a problem at all.
There are good restaurants within 3 minutes of the apartment (ranging from cheap to expensive) and generally used by local people, this is not a tourist hot spot.
Would I go back? You bet! Without doubt the best Airbnb I have used.