Meghatron

I second asking for full-length rails; they work well for my DD who does not sleep in one position.

That said, if you are going to put a mattress on the floor, don't even bother with the pull-down bunk. Just tell your host you're not going to use it and that you'd like a mattress made up on the floor instead. They are happy to do it. On our last cruise one night my in-laws hosted all four grandchildren in their sleeps-four 5A stateroom. They slept in the queen, the two eldest slept on the sofa and the bunk, and somehow our host also managed to make up an extra twin and the baby's pack-n-play in the remaining floor space. It looked like a game of Tetris. But they had a great time and we made sure the host was taken care of. :)

Well, they tend to "sell out" as soon as they are available (120 days) for Concierge/Platinum CC members. But, keep an eye out (as in check every day - or twice a day), sometimes one will pop up as the cruise gets closer.

I second this. We managed to get the last one at 90-day Silver check-in for our January cruise. So yes, it really can happen!