I stayed at Marco's apartment for 3 days with 4 other guests and the location is amazing. He gave us specific directions to his apartment (which really helped us cause we are new to Rome!).
the apartment was 10 - 15 minutes walk away from Termini station and that can take you anywhere in Rome. Every tourist site we wanted to see was only 2 stops away from the center.
Shops, restaurants and grocery stores were all nearby, so we can cook our own food.
the apartment was really clean and spacious. I recommend this to anyone who is new to Rome and is travelling with families or groups.