If you're looking for a cozy apartment in a fancy neighborhood, this is NOT the place for you. The place is actually a cellar, with two large bedrooms, but tiny kitchen and with toilets which don't give enough privacy.
However, if you're not too spoiled, and you're after a good location (25 minutes walk from Postdamer square, or 5 minutes to the metro station), very friendly and welcoming English-speaking host, and very good value-for-money - that's the place for you.
We enjoyed a lot our stay.