That flat is on the top floor with a small lift and a tight winding staircase. If you have a problem with either of these, this is not for you.
Once inside, there is plenty of room for 3 people and it would be okay for 4 as long as 2 were quite small!
Small functional kitchen and 2 shower rooms which are all fine.
Host met us outside and gave some great recommendations for visits and for food.
It is located so that it is an easy walk to all the major attractions of Rome.
Highly recommended.