We spent 7 nights in the apartment while exploring Rome. The apartment is ideally placed in a bustling neighbourhood with good local amenities including shops, restaurants, bars and a nearby supermarket. The apartment was a perfect place to be: well equipped, comfortable and peaceful with minimal noise from neighbours, and we were made to feel very welcome.
There's plenty to see locally: Testaccio Market & Mattatoio, Monte Testaccio, Pyramid of Cestius, and the cemetery on Via Caio Cestio. We also used both buses and trams to explore other areas of the city, though I'd recommend walking where possible as there's so much to see as you go along. If visiting the Colosseum I'd recommend using the Palatine Hill ticket office and then walking on to the Colosseum. We queued for 5 minutes at 8:30am and were in the Colosseum just after 9am.
I would definitely recommend the apartment as a great base to explore Rome.