This is a fantastic base. A beautiful view from the balcony of the Basilica. It was quiet easy for us to get around by foot (which I highly recommend) and very easy to get to Trastevere.
Catharine was very communicative and helped us sort out issues with the accommodation when I got the dates for the booking wrong. Whilst the apartment is hard to find when you first arrive so follow Catharine's advice instead of looking for the apartment numbers!
The apartment is small and cosy and we had small breakfast on the first morning which for an early morning Vatican tour helped us a lot!
I'd highly recommend staying. It can get a wee bit noisy if the residents in the corridor are making noise but it was a minor. We'd definitely think about staying here again.
Also pretty safe at night