As long as we're talking about towels, the stickers on everything at the Montreal Marriott Chateau Champlain really, really grosses me out, to the point that I can't stay there ever again.
Also, I sometimes end up in a room with two other adults, so we definitely need at least one big towel each. I have fairly long hair, but I usually make do with one towel, as the entire summer, my hair goes up into a ponytail after I wash it.