I stayed in Susanne's apartment recently with three friends and it was an absolute dream! It's an enormous space with high ceilings that's beautifully decorated, so everyone felt extremely comfortable and at home. The place is kept immaculately clean and has enough washrooms to make it easy to get out of the house in the mornings if you're traveling with a few people. All of our needs were met.
The location is great with the grocery store, subway, notable restaurants and taxi stand just steps away, and Susanne is fully prepared with maps and recommendations upon your arrival. Very helpful.
She is truly a lovely, kind and accommodating host who runs a professional service. This was easily the best reservation on our five-city Europe trip and if I'm ever back in Berlin, this is where I'll be staying.