Many elements make a city a great place for innovation. Makerspaces where products can be designed, prototyped, and manufactured. A university with a department dedicated to entrepreneurship. But, none of these things matter if the city isn’t attractive to live in. Low rent and high quality of life are a plus. A thriving arts and music scene, and a diverse, young population. Oh, and lots of good coffee. These are Popular Mechanics' Startup Cities.