Location, location, location. This apartment was perfectly situated near the Trevi fountain and the Pantheon. Numerous quality restaurants and cafes are easily accessible. For the more adventurous types even farther away places like the Vatican, Collisseum, and Trastevere are within walking distance.
While the apartment was lovely we did have issues with the shower draining properly - any water pressure higher than a trickle would pool at your feet - and the shower itself was rather small.
Our hosts and their concierge staff were welcoming and helpful before and during our stay.