We had a great stay in Marzia's apartment.
We stayed for 4 days, 5 nights in August.
Marzia met us and was very welcoming.
Apartment is in a fantastic location for us as we have stayed in Rome before and always walked to Trastevere for dinner.
Being able to walk to many restaurants and bars within 2 minutes is brilliant in the evening after days out sightseeing.
Apartment highlights: plenty of space, the terrace (good for drinks or having a meal in), very good air conditioning, the amazing high wooden ceilings and good powerful shower.
People keep have mentioned noise at night - of course you are on the main piazza in Trastevere! We found it got quiet around 11pm (except Saturday) but kids slept fine earlier. We all actually enjoyed the background ambience as part of our stay.
So I strongly recommend this apartment for a stay in Rome. The location and having a terrace are just great.