Great stay with Roman Holidays and would return!
Pros:
Location is great, there is a lovely coffee/pastry shop on the corner and supermarket opposite, gelateria and really nice authentic restaurants within 5 minutes. It's only a 15 minute walk to the metro and 30 minute walk to the Colosseum.
Spotless room, big comfy bed!
Access to kettle in shared kitchen area
Lots of space
Aircon worked well
Potential improvements:
Would be great if a few more hangers were provided for clothes
Unfortunately you can't let much natural light or air in as there are shutters on the window