The location is excellent, with many decent restaurants. I would go toward Piazza Trastvere for the better ones. I tried one or two across from Piazza San Cosimoto, and they were mediocre with tourist-grade food and careless staff. For groceries, I recommend Carefour, across Via Trastevere, or the big supermarket on the floor below the department store on Via Trastevere. It was a huge surprise because there are no signs. Ask Marisa about it.
In the summer, there are free outdoor movies in Piazza Cosimoto, including some that are good for children. There also is a playground popular with the children.
I am a travel and food journalist writing about my experiences in Italy, so I needed reliable internet service. But it was often not working. Not Marisa's fault, but if you need reliable access, I'd recommend having sufficient international data on your plan. Note that the bed is actually a fold-out, which is low to the floor, but it is comfortable.
Because this apartment is a little below street level, it is cooler in the summer than something on a top floor. It can be a bit noisy with pedestrians and cars passing the windows, but it becomes quieter at night. Closing the shutters helps a lot. Have ear plugs if you are a light sleeper.
Marisa is kind and accessible.