I stayed at Sara's with my girlfriend for 4 days in her flat in Berlin. The flat was beautifully kept, warm and cosy; in a very good area. Sara was away on holiday when we were staying but Jan, Sara's partner, gave us the keys and made sure we settled in well. He was extremely friendly and helpful throughout the stay.
I highly recommend this place and these people, both are wonderful and will make your trip so much more enjoyable.