"Location, location, location" - Via Urbana 108 is on one of Rome's most charming streets, one which has retained its pedestrian charm (and Italian feel, rather than touristy one). Yet the apartment is ideally situated for public transportation in Rome's heavily trafficked city: one can walk there easily from the Leonardo Express from Fiumicino, and the clean and convenient Metro B is 3 blocks away.
In addition to that is the hospitality of the hosts. Gian Paolo's helpful tips about the neighborhood opened the Monti's splendors to us, including fabulous restaurants. His son met me upon my arrival from an overnight flight, and showed me the apartment, explaining heating and the like. Throughout my stay he responded instantaneously to any questions I texted or emailed. Wonderful!