We usually take our tea and coffee in Mado which has a lot of branches all around Istanbul.There coffee is good and their cakes is good too .
Basically ice cream store but changed dramatically to all food restaurant. breakfast is pretty satisfying. tea is no special. try deserts, pretty delicious but little expensive.
Very nice Turkish traditional cafe available every where in Istanbul .they serve nice breakfast and light sandwiches and pastries .the service is good and seating as well is very nice