Antonello is a great host. He is quick to respond to queries and works hard to make sure your stay is a good one. The apartment is as it is described - and the shower is awesome. The street outside can be noisy if you are using the sofa bed in the living area but not excessively so and nothing that shouldn't be expected in a city location. The bedroom is very quiet.
There are lots of places to eat within easy walking distance including take away pizza slices down the road - and a winebar listed in many of the guidebooks. There are also lots of interesting small shops locally (and a supermarket).
The location is excellent. We walked from the apartment to most destinations and bus route stops are not far away - as are the hop-on-hop-off bus stops.
A few tips if you are new to Rome and prefer independent tourism: St Peter's Basilica is free to enter. You do not need skip the line tours. If you want to walk straight in get up and be there at 7am. It really is worth it. For the Collessium buy timed tickets from the Collessium website. They work. For the Vatican museums look at their own website. We paid more for an early breakfast and before hours access: it really is worth doing this. There were only about 20 people in the Sistine chapel when we went in. Expect security checks at all major sites.
The apartment is in an excellent location if you walk a lot. After the early mornings in the Vatican it is easy to return to the apartment for a rest before setting off again.
Thank you so much Antonello: you are a very helpful host and the apartment is an excellent base for a stay in Rome.