The Motobecane Bistro 3V Stylish City Bikes in 3 Speed Internal with rustproof aluminum frames. 
Check it out.  Components and City Style are key in this design. Internal gear box means easy low maintenance and less fuss. Wide range of 3 Speeds means MUCH easier pedaling than simple single-speeds. Single-speed bikes are great but more gears are best in hills or headwinds.

Wide selection of gears means you can shift to any you wish for the best efficiency and comfort

Lightweight Aluminum Frames means the frame will never rust and is lighter and easier to maneuver

Stylish Matching Quilted Stitched Grips and Matching Super comfort spring saddle and wide tires mean you practically float along with reduced road jostling. A City-rise handlebar position and stem make this the bike super Cityable! 

Compare this bike with others costing well over $1,000, don't pay a giant price tag
buy it for the low price of $399.95 from bikesdirect.com

FREE KICKSTAND INCLUDED ($20 value)

Bistro Sizing Guide.
Mens 51cm fits most riders from 5' to 5'9
Mens 56cm fits most riders from 5'9 to 6'2"

Ladies 44cm fits most ladies from 4'10" to 5'6"
Ladies 49cm fits most from 5'6" to 5'10"

This is a general guide, Size up for long arms/legs/torso. Size down for short arms/legs/torso.
Sizing is a personal preference, the final choice is up to you