Hotel Karolinger

I booked this hotel in advance. I arrived at 4pm and I took out the key from the mail box. There was no reception. I climbed the stairs and when I opened the door of room nr16, I was shocked by the smell of humidity. The wall had yellow stains. Being the room small, made it even worse. It was impossible to breathe. I called the hotel phone number, a lady replied, but she couldn't give me an answer if there was another room available. She was needing to contact the boss. After the 3rd call, and also calling the web site agency, the lady told me that she received confirmation from the owner that there was no room available. To the complain that I submit through the web site the owner replied that they were not able to refund my money because I had use the room and they will need to clean it up. I only stayed 45m at the door of the room, trying to get an answer.