Marco's place is in a great location in Trastevere and very quiet even though it is in an area with lots of cafes and restaurants. Secure building and on the first floor so only about 10 steps to get to the landing.
Apartment itself is small but has all the basics you will need especially if you are planning to be out sightseeing most of the time. Bed was very comfortable.
Main issue we had was that the shower was extremely small. It was quite difficult to negotiate and meant that water kept leaking out or we would often hit the shower tap with our elbow and burn ourselves with hot water! There is a dryer, toilet, bidet and basin in the bathroom.
We had to use the spare towels to mop us the excess water and fortunately had the balcony to dry them.
But overall great location and it had the things we needed for a short stay in which we were out most of the time. Also very convenient to get to/from airport via train and tram.