You must stay here! Sonja and her place are seriously one of my best stays I have had in an Airbnb and I've been traveling Europe for 3 months, so I have the experience to compare.
I'm also an Airbnb host in Los Angeles, so when you find another fellow host that's doing Airbnb right, you want to celebrate and recommend them.
Sonja herself is a warm and gracious host. She is responsive in communications, always available by text if you have any questions. She opens up her home to you as if it's your own. She even offered me laundry detergent so I could wash my clothes. (Thanks for this Sonja, I've traveled so much and had to buy laundry detergent all along the way, it was nice to that you offered me yours.)
The location is centrally located with everything you need just minutes away; food, drinks, sightseeing, grocery stores, shopping, parks, the river and the Underground just a 3 minutes around the corner.
Better then location is the cleanliness of the place, from the floors, to the kitchen, to the bathroom. She even had toiletries for guests to use, in case you may have forgotten something, even a hair dry (which is nice for us ladies).
I only slept in one of the two beds. Here is my glowing review of the front room bed, I found it so comfortable with plenty of blankets, fluffy comforter and a good variety of pillows. I should mention that it is a 5th floor walk up, this does makes for nice views of the garden park and breath taking sunsets.
Your stay in Berlin will be great at Sonja's, request to book today. You can stop your search now.