Diesel is just what a coffee shop should be: a balanced union of hip and cozy. Helping up the cool quotient in Davis Square, Diesel has walls full of original artwork, high ceilings with exposed beams, red-felt pool tables, and comfy couches. Favorites of the house: Vietnamese coffees, aromatic teas, various espresso concoctions. Amenities: a laptop-friendly environment and miniboxes of cereal at breakfast time. Best part of the experience: being able to glance out the window at the green sign of a certain Seattle-based cafe and feel darned good about going indie.