I have been coming to Berlin for a few years now and stayed at many airbnb apartments and Katie's place is definitely in my top 3: a great space with high ceilings, tastefully decorated and with all necessary amenities. The apartment feels very peaceful and quiet and is located in a great neighborhood.
Katie was a very attentionate host and every thing went smoothly from booking to when we left for the airport.
I know I will definitely want to stay here again next time I'm in Berlin.