My crew and I came here early and often during last semester's study cram for finals and found the place pleasant, welcoming and most importantly, open late.
Unlimited refills on black coffee? Check
Beer and wine for post-study? Check
Couches in a secluded alcove? Check
Friendly service? Check
Affordable? Check
Clean? Check
Check? I don't know, I paid credit
Oliver's isn't in a competition to be the most hipster of all coffee shops (go to Lux if you want that).
Also, try the food. It's fantastic.