That's a real nice place too. We stayed there for 4 nights on one trip. It would have been my 2nd suggestion, but you originally said "location" is the real important, and my other suggestion had a better location.

This place is right across P. Barberini from the Subway station, so it is very convenient. On the corner is a little store for munchies and water/soda. It's also a major bus route (around the corner). In one direction, you can grab the bus to Termini. On the other side, you can grab bus 492 to zip you real close to the forum, and Lago Argentina, for Campo Fiore and Piazza Navonna.

Trevi is only a few blocks, and the Spanish Steps only about a 10 minute walk.

Excellent choice!^ They were also very helpful in arranging airport pickup, and a taxi to Termini when we were leaving. You'll love the elevator!