Oh, Yeah! is a very friendly place, the coffee is good (and fair trade if that's your thing). The ice creme is great and with the tons of mixings there is always another reason to go back for more.
Another key are the waffles, made fresh when you order them and can come with your choice of any mixing or ice creme topping.
While this isn't a place that I would go and spend the afternoon working at (for that I would go to Coffee Tree Rosters on Walnut) but if you want a great cup of coffee, good conversation or a waffle then check out Oh, Yeah.