We have been able to visit Rome by walking at practically all times. So the location of the apartment is almost perfect. Easy to walk to the Pantheon, Piazza Navona, Campo del Fiori, Fontana del Trevi, Piazza di Spana and del Populo (though a bit further); we have walked to the Coliseum but went back to the apartment by taxi.
We have enjoyed very much the Trastevere area, a lot of very good restaurants with typical roman food! Museums, cathedrals, churches, outstanding surroundings! We recommend Andrea's apartment without any hesitation.