I had about 3 hours to kill before a meeting so I camped out in Cafe Istanbul.
It's a comfortable, Turkish place with really good apple tea, great staff, free wifi, comfortable seats, and mediocre food.
I got a pepperoni omelette which was edible, but the apple teas were fantastic.
During lunch hours, the place got pretty lively, but nobody hassled me for having a laptop out.
Nice folks working here.