We really enjoyed staying at Roberta & Francesca's apartment! The house was big enough to comfortably accomodate all six of us. The kitchen was very well equipped (not one, not two, but three Bialetti's!) and we cooked some wonderful dinners. Though the weather was not always fantastic we could sit outside in the pretty garden.
Though not super central, the neighborhood really is very nice. Everything you would want is walking distance, including the metro to go further into town. Walking to for instance the Colosseum took about 20 minutes, so that was very doable as well.
Contact with Roberta and Francesca was really smooth and the rent went exactly as planned and discussed. The apartment was super clean and we felt really welcome right away.

All in all a great place to stay and discover beautiful Rome!