Stefan’s place is a great find! I would recommend it specifically for solo travelers. It’s in a well kept apartment that you’ll be sharing with Stefan (who sleeps in the living room with a door closed, so you both have privacy). He’s a great host, he had lots of recommendations for me! The area is also great and easily accessible by public transit. If you’re looking to enjoy Berlin by yourself but want something nicer than a hostel this is the place for you :)