When you're looking for a reliable coffeeshop that is *not* Starbucks, I recommend Caribou. Maybe you think that in modern society we are too conditioned to comfort, but there are things I enjoy about Caribou: guaranteed cold A/C, comfy chairs, smiling service, decent coffee and better-than-average-yet-overpriced drinks, reliable wifi, long opening hours.
This place doesn't, can't, have much personality like other coffee places around Pitt, but if you don't want to deal with grungy hipsters and sweat your butt off while trying to maneuver and find a decent wifi signal, go to Caribou.