We loved our stay here! The space very comfortably fit two adults, a 12 year old and a 10 month old. The elevator is tiny, but it could fit all of us at once (no room to sneeze though!). Then you only have a few (about 10) manageable steps to reach your door. We felt safe and secure throughout our stay.
For those traveling with a baby: the crib and high chair are great! Also there is a bath tub and clothes washer (no dryer- just air dry). There are two steps up into the bedroom with the bunk beds, so you just have to close the door or be careful around them as well as the flight of stairs up to the second floor. It is very easy to return mid day to reload your diaper bag or switch to a stroller.
The location could not be better. We enjoyed taking in the Pantheon or Trevi each day depending on which direction we were walking. Also, the rooftop terrace is incredible. Although it was a bit chilly during our stay, we still enjoyed relaxing outside and the fresh air.
We didn't meet Viviana, but her associate Francesco was amazing. He was always available and quick to respond. We had a drop in water pressure that I couldn't fix by myself, so he ran over within minutes to fix it for us.
We would love to return to this apartment, and we think it would be a great gathering spot if you were traveling with multiple families.