The location of the apartment is perfect! It's right in the center of the city and walking distance from the best tourist sites. My wife and I never got tired of stepping out of the apartment and gawking up at the Pantheon in all of its imposing glory. Despite being yards away from one of the biggest attractions in the city we found the apartment relaxing and removed from the noisy crowds.
Serena was a wonderful host for a pair of Americans relatively inexperienced with international travel. She was always timely in her responses and never made us feel like we were burdening her with our questions. Best of all she provided us with a binder full of restaurant recommendations. You'd be smart to follow her advice because we had some of our best meals of the trip following her recommendations.