Awesome !
I loved my experience in Berlin, Lena's place is very nice and confortable, she was there waiting for me by the time of my arrival, gave me the keys, showed me the house, explained me how to get to the airport by the subway, etc. She is really nice.
The house is near a subway station and there are some restaurants nearby, for those who likes to walk, it is about 2 kilometers from Jüdiches Museum, Checkpoint Charlie and Topografie des Terrors.
I Seriously recommend.