In general, the more mid-ship and the lower down you are, the less motion there will be. So all other things being equal, a deck 3 room will have less motion than a balcony room.
I agree. Not just for cruising, but anywhere.
I would love to have been in on the very first meeting where someone suggested, "Let's put water in a bottle and sell it".
I thought there was such a number. I was responding to someone that had stated that they like to have their cell phone available in case someone needed to reach them while they were on a cruise. I remembered there being this alternate way to reach them.