Marina's place is amazing! Not only is the apartment itself great (and can fit a lot of people), but it's walking distance from the Pantheon, Campo de Fiori, and Piazza Navona. We even walked to the Coliseum (although this was admittedly a little farther). And the main bus which runs from Roma Termini all the way to the Vatican past some pretty important sights stops outside the apartment, too. Marina was an amazing host and even helped us hire a car for the ride to the airport. Definitely recommend!