Partner and I stayed at the Pension Gitte which is about 2 blocks away. We went here mornings for a coffee and a light breakfast (rolls, pretzels, etc.) They have that plus sandwiches and excellent cakes, we were there in December so we were able to try a variety of their Stollen (Christmas cakes). Personnel were friendly, comfortable place, the best coffee that I had in Berlin. It is a bit off the path but easy to find. If you are shopping on the KUDAM, then leave it and go over to this for a nice break.