This apartment is gorgeous! It's impeccably decorated, and more than enough space for a traveling couple. Nice finishes, comfortable bed, and looks right onto the main piazza/fountain in Monti. Colosseum is steps away, also.
Other reviewers have mentioned that it gets loud out in the square at night - which it does - but the windows in the apartment block out any such noise from the party below. Personally, I chose this apartment because of its proximity to the square - allowing us to pop right outside, enjoy a take-away cocktail on the steps of the fountain - and you should to!
I could not recommend this apartment enough!