We went to Cafe Tuna every morning for breakfast and to plan what we would do that day while we…read morewere in Berlin. They have free WiFi and the people working there are very nice. Their tea was only €1,40, and a large cappuccino, which was very large, was very inexpensive (the exact amount escapes me now).
They had fresh pastries of all sorts, sweet and savory, and they also sold day-old pastries for €0,50. My fiancé got a day-old ham and cheese croissant one day, which he said was just as delicious as a fresh one. (Why he got an older one is beyond me, maybe they had already sold out of the fresh ones?) They also have regular breakfasts (bread, ham/salami and cheese, eggs), muesli and yogurt, and sandwiches and salads. One day I got an egg salad sort of thing on half a baguette, and that was really good.
There's really a drink or snack for every taste and dietary restriction, and the place itself was very comfortable and nice to visit - hence our going 4 mornings in a row!