The apartment was fantastic -- perfectly situated within walking distance of everything, and ideal for a family of 4 with two children (13 and 11). An easy walk from the metro (past the Spanish Steps!) -- we purchased metro passes to travel the 3 stops from Termini station, but never used them again. Instead, we were able to walk to the Trevi fountain, Colosseum, and Vatican (a longer walk on a hot day, but still very manageable), as well as a myriad of other places for food, drinks, and sights.
Elisabetta was waiting for us when we arrived, and had great advice about restaurants, sites, and arranging airport transportation for our departure. The apartment itself truly is better in person than in the pictures (I think I stole that from one of the other reviews I read--and can second that). Every amenity was available -- great air conditioning, an open, sunny, high-ceiling layout, and a large flat-screen TV that came in handy for World Cup matches after a day of sightseeing. We also particularly appreciated the washer/drier halfway through our two-week trip!
Overall, nothing could have been better. Thank you for a terrific visit!