Most affordable place we could find. Lukasz is a flexible host who does effort to make you have a pleasant stay. The location was good and made it easy to experience Berlin. The room we stayed at is the living room of the appartment. The athomsphere, temp etc was all fine. We slept on the couch, so there is room for improvement regarding the quality of sleep. Also, the shower didn't invite is to be used due to the state of it and there was no lock on the bathroom and rented room.
With all this considerend, we give the place 3 out of 5 stars and we would recommend if the things mentioned above are no bother to you :)