Location: very good /close to colosseo about 10 minutes by foot/. Most of time we're walking because we really like IT.
Metro: there is two station nearby
Apartament: excellent for 6 person /three bedrooms and two bathrooms/. Located at the second floor. When you arrive somoeone from staff will give you keys and explain everything.
Next to apartament there is nice caffee bar - cappuccino for 1 euro ;)
I trully recommend Francesca as a host and La Dimora Colosseo.