Highly recommend this place! We visited Berlin as our son is attending school nearby. Can't say enough about what a fantastic place this is. Clean, beautifully appointed, comfortable and with everything you need right at hand -- we thoroughly enjoyed it. The kitchen is thoughtfully stocked and super-functional. The bed was very comfortable, the shower, bathroom and all - stylish and very comfortable - we felt quite at home! It is what you would call a daylight basement in the US - great light by day and at night, we shut the shades.
Location is great - right by the bus, a few blocks to the U-bahn, we were able to get out and about with terrific ease. We particularly enjoyed the the bakery and market just down the block. Our host was very responsive and gave us great guidance on local eateries (Defne for Turkish food - yum!). I'd highly recommend!