The perfect height for a woman is somewhere between 5' 2" and 5' 6". Most women think this is too short, but this is only because they misunderstand what men like about women. In this range, a woman can be sexy in heels without being too tall and cute without them. Men love women with the ability to be both.
Disclaimer: I am 6' 2" and this is only my opinion. The important part is the last sentence.