My new fave cafe in Georgetown features exceptional tea and coffee, out of this world (looking) (but not nut free) baked goods, & a fun (but not annoyingly perky) staff. Located on Thomas Jefferson street behind Barnes & Noble, it's a great alternative to corporate coffee when you are in the area.
An example on how this place is so cool, today they were asking all AM customers to name the superhero he/she would like to be or to name a superpower he/she would like to have. They called your super-name to deliver your coffee from the bar. (I chose "Shape Shifter" as my power. Because I'd want to be "Mystique" from X-Men but, you know, a dude and neither blue nor scaly!)