About the only special thing we brought because it was an inside cabin was a glow-in-the-dark, battery operated clock. The cabin was very comfortable, both for just the two of us, and this past trip when we had my father-in-law with us. There is a privacy curtain which closes off the sleeping area if you want it, and we use it a lot because I'm an early riser, and an early sleeper, and husband and his father are night owls. We don't take a lot of stuff with us, so space in the bathroom wasn't a problem. There's plenty of closet and drawer space for two people, and suitcases (except for our huge one which won't be making the next trip) fit neatly under the bed and out of the way.
We love the fact that it's very dark inside, because it stays cool and feels good when you've been outside most of the day. There are pictures of the cabin on both of the links in my signature. I think you'll be very happy there, and use the money you save to book your next cruise!
Beth