Just came back from a great stay in Rome at Marco's apartment. I can't recommend this place enough. Marco is an amazing host. Communication was great -- he is super responsive to emails and answered every question we had in a timely manner. He met us at the apartment and had even purchased some basics and some lovely holiday snacks for us. He helped us arrange transportation from the train station and to the airport (Emanuele, the driver was punctual and polite, and his car accommodated the 5 of us and luggage really well).
The apartment's location could not be better. We loved being walking distance to so many sights -- the Spanish steps, the Pantheon, the Trevi Fountain, and the bustling Via del Corso are very close. Also very walkable are the Campo di Fiore, the Forum/Colosseum/Palatine Hill, and so many other sights. The street and neighboring blocks are filled with high end boutiques and several nice local restaurants. Despite being so well located, street noise during sleeping hours was minimal.
The apartment was perfect for our family of 5 (including 3 teenagers). The living space is roomy -- the large dining room with seating for 6 was our hub. The beds are very comfortable with firm mattresses and nice linens. With three teenage girls, the apartment's two full bathrooms are a huge plus, and one of the bathrooms was quite spacious, especially by European standards. The kitchen is cozy, but VERY WELL stocked. There is a washing machine, but no dryer.