I am renting out an extra bedroom in my flat in Berlin Mitte. It is pretty small (8 sq. m), but is located just in the heart of Berlin. It is a perfect base to explore the city. The room is rather basic in terms of furnishing (bed, chest of drawers, desk & chair, clothes rack), but you are more than welcome to spend time in the cozy living room or use the fully equipped kitchen. Please help yourself to tea (I have a large collection), coffee and musli/yogurt/toasts/fruits for breakfast.