We really enjoyed Mascha's apartment in the funky neighbourhood of Friedrichshain. It's a great location and you can watch the streetlife from the balcony.
It's easy to get to all the main sights and you can walk to the East Side Gallery in minutes.
We were welcomed by Mascha's sister and Mascha herself was very prompt to reply to messages quickly and deal with any questions we had. She was a very helpful and thoughtful host. We will definitely return there if we visit Berlin again.