Our stay was just perfect. Collected the keys from the office and the penthouse was just round the corner. As others have said, the lift only goes to the 7th floor (penthouse is on the 8th), but to be honest, we only used the lift twice in five days - our legs benefited from the stairs. Communication was outstanding, the flat was spotlessly clean, if a little sterile. Location could not have been better. Brandenburg Tor station was 2 minutes walk away. Close to supermarkets too (shut on Sundays !). All in all, a superb AirBnB, probably the best I've had.