The apartment is amazing, very clean, and comfortable.
The area is great, within walking distance of the Vatican and other must-visit places in Rome.
Great restaurants and cafes in the area.
I highly recommend this outside of the colder season. I bet it's great in the Spring / Summer / Autumn as it also has a big balcony/terrace where you can stay with your family or friends.
When we were there, in February, it was pretty cold inside the apartment (under 19Celsius) with no real means to heat it up.