Martha's place - with John's bakery right outside for treats and cappuccinos is very well located in pankow - 3 buses stop right outside that go to the train and all over - the Berlin public transit situation is fantastic - and there are two shopping markets in close walking distance - the rewe around the corner and the edeka next to the train station - both have bakeries with fresh bread and feature good take out and everything you need.
We enjoyed our stay!