As will all the other reviews, I was not disappointed. Frank was awesome, easy to talk to and communication worked flawlessly from our inquiry till the day we checked out.
Do yourself a favour, and stay at his place in "hip" Kreuzberg , plenty of restaurants, cafe's, bars and you will experience proper Berlin with the locals instead of staying in the centre of town with thousands of tourists! We hired bicycles nearby for 8 euro's a day and cycled the whole area and the neighbouring area called Neuköln, which is another "hip" area full of cafe's and bars..