Had a fantastic stay in Trastevere with my wife and one year old. The apartment is in a bustling area of Trastevere with restaurants everywhere. Walking distance to every major sight.
As others have mentioned it is a very busy area of Rome and at night the streets are lively, loud, and full of people but the apartment is quiet especially the bedroom and terrace are essentially silent from the street noise. You would have no idea you’re in a busy center while sitting on the terrace or going to sleep. Our one year old was able to sleep without issue in the main living area as well, which is the loudest area in the apartment.
Someone mentioned in their review the terrace is small and there is no coffee - I disagree. There is a 3 person couch and a table for 4 on the terrace, plenty big, and there is a Bialetti Moka style coffee maker available.
There are a few flights of stairs to get to the apartment and no lift so if you are unable to carry luggage up stairs for any reason then this may not be the place for you. Stefano was very helpful in arranging a van to pick us up from the airport when we arrived and take us to the train station on our departure.
The only thing I would change about the place would be a new bed, the current one is pretty slim and firm.
Overall an absolutely amazing trip to and stay in Rome and I would not hesitate a moment to stay in this apartment again. Thanks Stefano for making this leg of our Italian vacation a great one.