PLEASE PLEASE PLEASE....stay at Frank's flat. It is amazing and super big. Frank is a great host and he was waiting for us after an hour and half of my arrival with a cold refreshment pitcher of water. The amenities are amazing. Frank really think about everything and every single detail like coffee, muesli, tea, shampoo, laundry service,speakers for your phone, guide tours flyers(in most languages) a huge map of Berlin in the kitchen wall and much much more so you can have the best time in Berlin without any worry. Public transport is all around the flat. From tram, train and underground. You can even see the television tower from the balcony. The neighborhood is hipster and very urban with great and tons of bars, coffee shops and supermarkets. Please please again STAY AT FRANK'S FLAT! HE WAS AN AMAZING AND SUPER HOST AND VERY WELCOMING. You will no regret it. I will go back to Berlin and definitely come back to his flat. DANKE Frank! :)