im 5'10" and road a 52cm IRO for a while fgg. as you can see, the seat is way up and the bars are very low. bought it off of some girl when i needed a bike badly. i will say that the first time i hopped on and tried to swirve around a ped, it bucked me right off. the geometry was so tight compared to everything else before that, that i could make much sharper turns, but i didnt really have a sense of what was too sharp for a while.

now i ride a 55cm pista and its much less fun but much more comfortable. i think there is definiteily a continuum between how comfy you want to be and how much control/skiddishness you want your bike to have. if your in the philly area you could test mine out.