53 cm is a tad too long for my tiny torso.
The issue with smaller top tubes is top overlap on 700c wheels.
You might be better off with a frame that takes 650c wheels - loads on eBay at very low prices
650c? How very dare you! Toe overlap is something I've grown up with and accept as 'normal'. I agree though 650's make a lot of sense for small peeps. I ain't THAT titchy, though!
@Wonkz started
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The issue with smaller top tubes is top overlap on 700c wheels.
You might be better off with a frame that takes 650c wheels - loads on eBay at very low prices