The Aurora is a really nice bike.
The 2 key dimensions for fitting are height and length. Given safe standover clearance for height (1-3" when standing), then you need a frame that gives you optimum reach to the handlebars. This depends on how flat or upright your back is as well as your body dimensions. More experienced riders use a lower, flatter back, and most fit guides assume the rider is using an advanced racing position. Try and borrow a bike that you like and measure its size.
NB the standover clearance height includes the seat-tube height + the bottom bracket height. Some bikes are styled with a lowered top tube, angled down at the back. This may give the standover, but has the length of a larger bike.
Ask for the dimensions of standover to the TOP of the top tube, and for the top tube length (from center to center of its ajoining tubes)
There is a good guide to bike fit at Peter White Cycles.