We were thoroughly impressed by Trastevere. It's a great location, packed with cafes, restaurants and shops. There seem to be a lot of locals in the restaurants and you don't feel like you are being charged "tourist rates" which we felt was happening a bit in the centre. When we were there there were at least 2 new cafes just about to open. A word of advice, the restaurants are very busy so booking is recommended.
The apartment was great, full of character and very well equipped and the air conditioning was very welcome. The location couldn't be better, it is a very short walk from the cafes etc but certainly didn't get too noisy.
Francesca was a great host, she was very helpful, even getting in some milk for our twin babies when we arrived. We wouldn't hesitate to recommend the area and the apartment to anyone. We are already planning a return trip.