When you're in school, you need places to meet up with other people. Coffee houses fit the bill. The more local you can get, the cooler you appear.
Spiderhouse is 'the coffeehouse' for people near campus. It's funky, eclectic and cool. It has this bohemian, hippy, christmas like, techno geek on laptops, pretentious sophmore philosophist, post party chillers feel.
Outdoor seating offers more at night, along the semi-romantic feel another poster mentioned. However, Mozarts would be a better place for that kind of stuff.
It's a great place to meet up with a friend and relax.
The coffee/food isn't why you would go here. The service is spotty as well. But the environment is friendly and coffee is only a token reason why you would be here.