I'm with Bikedued. I'm 5'6" on a good day. Every LBS thinks I should ride a 52-54.

I ride a 60x63 labeled '88 carbon frame 60% of the time, a couple of 58's, and the rest 56's.
I simply don't stand over the frame. If I'm straddling the bike, I'm either moving or waiting at a stoplight, one leg down, the other up on a raised pedal. I simply don't have time to "stand over."

If you like that bike, ride it like you stole it, and don't worry about it.