Good freight access should be considered. A. Location - Small main street towns or towns with a court house square. Try to be in the best block or on the prosperous side of the square. Angle parking is best. Consider a second choice block to gain angle parking over parallel parking.
Parking meters are no problem.
You probably are thinking that downtown parking is no good. It is actually a bonus to a donut shop. Once the parking is full, you have the advantage of the extra foot traffic generated by the other merchants. Sales from this foot traffic will far surpass the business you could expect from a private parking lot two blocks away with 35 mph traffic that has to make a specific stop for coffee and donuts. B. Location - Towns of approximately 15,000 or larger.