I ride a 59 Pista, which my lbs recommended, and I probably could have gone with a 61.

In order to give myself some relief from the crowded cockpit, I have installed a seat post with a 35mm set back.
This puts me a little further back over the rear wheel and has worked out for me.

I guess I would say that a rider should consider not only his or her total height, but torso length compared to leg length, as well.

After a year of fiddling with fit, my slightly small 59 Pista now serves me better than the obvious choice of a 61, but only because I experimented stem lengths and seat post setback.