My friends and I had a lovely stay at Heike's place- it was clean and spacious, surrounded by really beautiful woodland. There's a big Lidl close by for picking up general supplies. Good transport connections to the city but it does take close to an hour on public transport to get to the centre of Berlin, which we didn't really mind as it wasn't too complicated.
Some other reviews have mentioned the paper thin walls- we only had a group staying over the other side of the apartment on one night and it got noisy during the evening.