My stay at Sonjas place was really great and I can absolutely recomment it!
The accommodation is amazing and you'll find everything you need there. The room is quite big and has a really lovely and light atmosphere. It's like staying in your own flat :) Also Sonja is a very friendly and easy-going host and will help you anytime if you have questions. If you're looking for a good place to stay in Berlin, I can absolutely recommend this one. I'd be happy to check-in here again :)
Best wishes and many thanks, Sonja!
Finn