I'm renting my room (~20m²) for the time of my holiday. Its situated in the very heart of Kreuzberg close to the public transport (1-2 mins to the bus M19 and subway U7 and S-Bahn) and supermarkets. There are three roomies but one is on visiting friends at the moment and the other is often working during the day, so you will not be bothered by them.
Unavailable: Smoke detector
Unavailable: Carbon monoxide detector