I only stayed one night but I can tell easily that Hannes is a great host!
He's very welcoming so is his beautiful house. Room is perfect, bathroom either and the breakfast in the morning was a really good first taste of Germany where I haven't been before.
Don't hesitate to ask him about places to see and go in Berlin Hannes will be very helpful with you (Curry wurst 36 indeed was a good recommandation :) )
Thank you again Hannes I hope I'ss see you both soon !
Take care