This film's main issue is that it's just trying too hard to be funny and heartwarming. Occasionally, it succeeds. More often, it's either strained, boring or awkward. It's full of actors mugging for the camera, trying to do something with a script that's never quite sure where to go.
One place it doesn't really go is Rome. Most of the action happens in New York. And even many of the Rome scenes were actually filmed in NYC. I'd call that false advertising.