Arnd's place was very close to Berlin Central Station, and only a 10-15 walk from the Reichstag and Tiergarten. It was a perfect base for us from where to explore Berlin for the weekend!
Arnd also very kindly stayed up very late Friday night to receive us after a very delayed flight from Gatwick as well as tricky public transport that time of the night.
We would very much recommend a stay at Arnd's place!