I had booked a deluxe room with king bed 4 weeks in advance. I checked in, and went to my room to find it was a stanfard room with a twin bed. I immediately went back to reception, and was told the hotel was full, even though I had confirmation of my booking. They moved me to a standard room, no refund for the difference. The manager did write to me and offered me an upgrade next visit, and access to the executive lounge. Nice gesture, but I only visit Poland about once a year.