If it feels good, ride it. Most people will say you have to ride a certain bike for certain sizes, but I don't agree fully. If you can get a comfortable position and full power through your pedal stroke, you'll be just fine and don't need to worry so much about the size of the bike.

That being said, if your body naturally fits, say a 58cm, then a 58cm bike is going to be the best if you come across one (just throwing out random numbers). In the meantime, you can get a 62cm to a 54cm bike (or bigger or smaller depending) and adjust saddle, stem and bars and do just fine.

P.S. I like the new color scheme with the white in there.