We lived in the apartment of Massimo with 6 people and we had a really great time (2 people on the couch). The apartment is located in lovely Monti area with a lot of bars & retaurants within 5 min walk. We did not use public transportation but the metro station is very close by too. The apartment itself was clean and offered everything we needed, especially two bathrooms are helpful with 6 people staying here.
Highly recommend this apartment!