My family and in laws stayed at Casa Teresa over Spring Break 2018. It was an amazing trip and Casa Teresa was a big part of that. It is very close to the Vatican and the Metro station (not that we used the Metro much).
The apartment is very easy to find and near some very fine restaurants, cafes and shops. Pierluigi even made a recommendation and secured a reservation for us at an amazing restaurant a few blocks away for Easter Sunday.
The interior of the unit is extremely comfortable. My kids (15 and 13) enjoyed having their own twin size beds. My wife and I thought our bed was very comfortable, as did my in laws. There was ample closet and drawer space so the room did not appear cluttered.
It was very convenient to have a washing machine in the unit, but it is very different than units in the US so perhaps some instructions on use would be helpful. Additionally, there is no dryer in the unit, but that seems to be the norm in European apartments. The bathroom had plenty of cabinet space and we were all able to use the bathroom, despite having six of us, including four ladies, use one bathroom.
The kitchen and dining area were helpful. We did not cook dinner but it was great to have a refrigerator or stove to keep a bottle of wine cold or heat up some leftovers.
The one area that was of concern was truly out of Pierluigi’s control. Several mornings over the course of our week there, we heard yelling or screaming coming from residents of the units above us. We did not know what the yelling was about (it was in Italian) but it occurred several times over the week.
All in all, I highly recommend this apartment and would stay there again if traveling with a group to Rome.