If you want one that fits in a closet, get a folding bike.
If you want a fast sports bike with gears and brakes on both wheels, get a fast sports bike with gears and brakes on both wheels :D
If you want to jump off hills and ride on curbs, buy a BMX.
And in general, one rather dull person said:
a powerful sports bike would be better!:D Heh-heh-heh!!!:D
P.S. It's not just Arandor who says "heh," so it wasn't him.
P.P.S. Buy a moped-stool) You'll be able to maneuver skillfully in heavy city traffic :)