A fantastic place to base yourselves in Rome. In addition to being close to the main train station, Umberto's apartment is also two blocks from a full sized supermarket (Google maps search Conad City) and more 4.5+ star rated eateries than we found in most other parts of Rome.
It's a 30 mins walk to most of Rome's most famous attractions and an hour's from the Vatican. These are pleasant walks, too, mostly through there old city.
The apartment itself was bigger than we expected based on the photographs and had beautiful high ceilings.
Umberto was a great host who speaks perfect English and actually waited for us on the street corner despite our flight being delayed 2 hours.
We lost water for brief periods for 3 of our days there but we were told this was an issue affecting the whole neighborhood and not specific to this apartment.
I'm summary, we had a very comfortable, convenient, and happy stay in Umberto's apartment and recommend it to anyone looking for a place in Rome.