The Koln Ciderhouse is a bar in the Koln Avenue District.
Detective John Kennex went there to find Tony Han, a low level dealer under The Bishop in order to set up a meet with The Bishop. He was accompanied by Dorian, but he told Dorian that the customers don't take kindly to androids. They also do not take kindly to cops, and Kennex was initially thrown out the front window after entering. He reentered again, accompanied by Dorian and they fetched Tony Han from inside.
Music emanating from the Koln Ciderhouse was 'Welcome to the Terrordome' by Public Enemy.