Love Big Dog Coffee! I am a huge fan of the oatmeal bar, iced coffee and iced lattes. I normally visit this spot everyday before work (oatmeal and iced coffee).
The interior space is beautiful, sort of a anthropologie feel to it. A lot of eclectic pieces with out looking like a cheesy TGI Fridays. Also the patio area has charming wrought iron furniture for the occasional nice day in Pittsburgh.
Pro: really friendly staff, oatmeal bar, sunny interior, great coffee
Con: Oatmeal bar can be a bit pricey( although the serving is huge), could use a couple more comfy cars.
Overall: Great place for studying, reading, first date and people watching!