Short walk from the colosseum, safe and quiet location at night, has a kitchen with all that you need, hot water is always available and good shower pressure, and the apartment is naturally cool even when it is hot outside. Simple place great for touring the city from and if you wake up late you might still reach your early-morning colosseum tour on time since it is just a short walk away (you can see it from the front of the building) :)
Antonio is a great responsive and friendly host!
Enjoy :)