El Diablo Coffee Co. is AWESOME! It's on Queen Anne and connected to the Queen Anne Bookstore.
I love this cafe and try to take all my friends to this place for coffee. I absolutely love the atmosphere. It attracts the artistic group, so it's a great people watching spot.
The cafe used to be two stories:
You came in the downstairs which is painted as if it were hell and you could go upstairs, which is painted to be heaven. But due to what I can only guess to must be financial issues there is no longer an upstairs. This makes El Diablo a bit less cozy and more ridged since most of the plush chairs were upstairs.

My favorite drinks are:
Cafe Cubano: A double shot of espresso and caramelized sugar at the bottom of the shot glass. Their coffee is really strong.
Cafe De Leche : Pretty much a latté but different? That's the only way I can explain it.
Lemonada: It's a carbonated lemonade drink which they make fresh (NOT the one in the bottle, although they serve those too).
All their food is good, if you pick anything I swear you'll love it.
The cafe sells t-shirts and sweatshirts, devil ducks, devil air-fresheners and some other cute accessories.

-Rikki