We thoroughly enjoyed our stay. The four flights of steps (with luggage!) were hard work but manageable. The apartment was very clean and well appointed, with great natural light and an air-conditioner for those warmer afternoons. The balcony was a perfect spot to enjoy a morning cup of coffee or afternoon drink.
The shower was temperemental (either scolding hot or cold) and it would have been useful to have some written instructions for the washing machine but these were minor concerns. What makes this place is its location - you're within 3 minutes walk of the Metro, 10 minutes walk from the Colosseum and surrounded by restaurants and shops. It's also very quiet, so felt like a real retreat after a day out in chaotic Rome. After you'd walked up the steps, of course!
Giulia was also very helpful and provided great assistance throughout our stay.