@susieq : The only cruise I was ever on was on a Windjammer sailing ship built in the early 1900s. You could sit on the toilet and touch all 4 walls, and the shower head was simply in the ceiling, you closed the door and it was a shower!
Now, as I've gotten older I require a bit more luxury; a mattress under me not just ground, camping but with running water, etc. But I'd envision sitting out on my balcony watching the scenery more than holing up in the cabin. Still, that's still something to worry about further down the line.