I stayed at the IC Porto during the summer for 5 days. The hotel w as full and they only had a +1 cat upgrade available. They did not mention this in anyway shape or form or make note of it, I only found out when I questioned it after arriving in the room.
I complained, it took a significant amount of fighting to get anything at all. This is what plagued me, they were sneaky about it.
In the end they reduced my rate by approx 20% and then gave me a +3 cat upgrade the following day but I sure as hell had to fight for it.