MacBook Air Cafes are places where almost everyone is on a computer, typically a MacBook Air. These cafes are typically sleek, airy, have a mostly white/gray palette, wooden tables, green plants, and healthy (often local) food - they are the Macbook Air of cafe.
Relatedly, this article calls Blue Bottle "the Apple of coffee."
May coincide with a reclaimed wood aeshetic in the cafe (such as Four Barrel) - "What Reclaimed Wood Meant"
See also: best places to overhear startup secrets