Rainer's little roof top penthouse was perfect for us. It was superclean and fresh; turned out I didn't have to worry about cigarette smell (as a non-smoker). Rainer was very friendly and welcoming and not only let us leave the bags at the apartement at our early arrival, but also gave us advice about vegan places in the neighbourhood. We recommend Ungeheuer Neukölln for breakfast, it was amazing. Rainer also surprised us with a sweet card and sparkling wine as it was my boyfriends bday! On the downside was that the place was pretty cold, as we were there in January. Heating was adjusted from another apartment so we had to ask Rainer to heat the place for us. During put stay the temperature in the flat went up and down quiet a bit (mostly down). Also the walls are thin so it was a bit noisy from the other apartment, a fact that won't bother the visitors that go out partying at night (which we didn't). Overall we were very happy with our stay at this cosy place!