During our stay at the restaurant, I showed a special bottle with custom-made etiquette to a friend. She looked at it and then we immediately put the bottle back into our luggage. This lasted about 15 seconds, during which the bottle was closed of course.
Immediately after this we were falsely accused of drinking our own alcohol by the boss there. This was after ordering 3 rounds of beer for 8 people, so it was not like we were not making them money. The boss was extremely arrogant, not willing to have any discussion. He just kept telling his staff to kick us out after we pay the bill. Even the waiters knew we did not drink our own alcohol, but had to obey his orders.
First they asked to pay the bill, which we did. Then they took our half-unfinished beers, and kicked us out. I visited 3 different Kozlovna restaurants, and was disappointed each time either by staff, food, or undelivered orders. This experience was by far the worst extreme though. I am never stepping inside Kozlovna again, and recommend you do the same.
GooglePlace - May 2017