I travelled to Rome alone with my two kids and we loved the appartement and the placement, everything was perfect. Trastevere is a very lively neighborhood and perfect to run around for the kids and have a good meal in the nearby restaurants. The appartement is a very bright place with a nice view over the roofs, furnished with a lot of taste and well equipped for everything we needed.
I highly recommend this place, we felt very "at home" and almost like real Romans ;-)