Rivilian we love the cabin safe too..but for some reason we ALWAYS forget to have ready the tip when we order room, laundry or dry cleaning services, and then as soon as we hear that knock on the door, suddenly like Pavlov's dog we remember and start our scramble for the safe!
So..for us having a little envelope handy outside the safe with some tip money will work like a charm...:-D
Quit anxious to read your review of the cruise ship Eurodam too. We've only been on the Osterdam and loved it. I think the Eurodam is a little smaller right???