Perfect location, it's next to the Termini station but the street is safe and silent. Colosseum is a walkable distance away (approximately 20 minutes) and the metro station is only about 5 minutes away, so it's easy to get to other main attractions in the city centre.
Fabrizio replies quickly and is very nice.
I stayed there with my friend and although the apartment is a little small, it was enough for the two of us.