If you want to be in the literal center of the action in Rome, this is a great location! It's around a block away from the main thoroughfare and right in the middle of the Pantheon and Trevi Fountain(literally, walk left to the Pantheon, walk right to Trevi Fountain). There's also numerous restaurants right along the street and lots of gelaterias and salumerias in the area.
Lavinia herself made sure to guide us the whole way to our unit and met us there to show us around the unit and give suggestions for activities and food around the area. She was friendly and easy to talk to and was certainly a highlight of renting the airbnb.
While it's located in a very busy alley, the unit itself was very quiet and secure. The inside was kept very clean and had a full kitchen and washing machine, it even has space to hang out clothes to dry.