This is a lovely apartment - open and spacious and clean but its key feature is the large outside terrace which, given the fabulous weather we had, was the main room used throughout our stay.
The location is great for the Coliseum (5 mins walk) and other monuments in ancient Rome but is but it is also easy to walk further into and across Rome.
Being in a side street off the main road means there is no traffic noise but there is a bit of street noise from diners and pedestrians at street level. However this is not intrusive and the evenings/nights are quiet.
The stair case is longer and higher than described and whilst not a problem for us anyone with a walking disability or very young children could find so many steps to be a problem.
Overall this is a great place to stay in and to explore Rome from - we would highly recommend it and Lorenzo was a super host throughout our stay.