We had a great time staying at Wibke's place! It's very convenient for the U-Bahn, although we ended up walking to all the main sights/museums out of choice. We didn't see much of Wibke as she was away for most of our trip, however she had arranged for one of her friends to check us in which was totally hassel-free. The appartment is amazing and has everything you could need - we really enjoyed our time there! Overall I would 100% recommend Wibke's place to others :)