Marcel's flat is the perfect place to stop in Berlin - it was as described, simple and clean. There is one large double bed, and one large double sofa bed. We arrived really late at night but Marcel was in contact the whole time, and met us at the flat (he lives in the same blocks of flats). It is a bit of a walk from the nearest station but no problem really, and there is a little Italian restaurant opposite. (That also do great coffee!) It's a great location for exploring Berlin and I would definitely stay here again.