The space was perfect for me and my 3 children. There would have been enough for 5 to sleep.
This is a safe residential area with the Vatican wall looming when you look out all but 1 window. There is a gate off the street, a main door to the building, another gate on the door and the apartment door. There is a security feature for when you are inside and a secure place for you to leave things in the apt.
There are no restaurants or shops next door, however we successfully ordered from JustEat dot IT after a tiring day. There are a lot of steps to get to the street with the restaurants and shops. To avoid coming back up them, take the easier ones further down, across from the Vatican Museum entrance. The pizza restaurant at the bottom of the steps was good. Turn right and about 2 blocks down on the left is a good little supermarket.
We had everything we needed at Mary's place. The driver she suggested got us right to her place at a reasonable price, we got a thorough explanation of everything, enjoyed the memory foam type bed, gas stovetop, large fridge, washing machine and shower with good water pressure. Tall people will fit in the shower, broad shoulders will be tight. It's a tight squeeze in the bathroom, so if you're quite large, you'll have difficulty.
Convenient to the Cipro Metro and bus routes off the busier parallel street, but we also walked from the other side of Castel St. Angelo.
We didn't use much heat even though it was freezing outside, and I imagine with the thick old walls and high ceilings it would be nice and cool in the winter.
We would stay here again!