Pina's place is pretty convenient and it was relatively easy to move around. Anyway, rome is pretty convenient by bus so it's easy to get anyway pretty much! Her house is comfortable and great, only that the shower space was much smaller than we were used to and it was a tight squeeze for some of us. Pina is very friendly and finds ways to accomodate our needs if there is any difficulty.
She knows some english but it is much easier if you could speak italian :) that aside, we could still communicate enough with each other and it was a pleasant stay!
Some pre-empt info to share: we had some difficulty locating the house initially - but it's just behind the porta san giovanni wall when you are backfacing Coin department store! Also, the 5 stories of stairs was a bit of a challenge as we were not expecting such high flights :D so be prepared to climb!