Vespucci41 was an excellent apartment for our (my wife, 7 year of son, and me) 4 days in Rome. When we arrived, we were greeted by Lorenzo, Alessandra's brother, who was very helpful and gave us all the information we needed to know about the apartment as well as good local information about Testaccio. The location is great and Testaccio is a wonderful neighborhood if you're looking for something away from the more touristy parts of Rome. We ended up not using public transportation while there as we walked to most places or used Uber. We spent a good deal of time in Testaccio itself.
The apartment itself is clean with the amazing bathroom (the photos don't lie), AC, and a nice little kitchen area (with microwave). The street is fairly quiet aside from the normal noises of light car/scooter traffic, sounds of people talking in the street, etc. Via Amerigo Vespucci is is not a bustling city street by any means.
Alessandra was available to us via telephone or mobile messaging and she checked in with us halfway through our time in Rome. We had an excellent experience and would happily stay here again.