I really enjoyed my stay. The apartment is exactly as described. It is 5 minutes walk to the S-bahn station (7 minutes if you take your time). Then, 17 minutes on the train to the main train station.
At the top is the street is a lovely bakery that is open Tuesday to Sunday and is a great venue for breakfast or coffee and cake.
I want to record my gratitude to Marion and Karl who came to collect me when my flight was delayed late at night. A heartfelt thank you for your kindness.
Put simply, I would return to stay in Marion and Karl's apartment any time and I would recommend it to anyone.