Any area you'd like to have a hard wearing, non slip floor is great for cork. A cork floor in a bathroom will feel warm and soft when you step out of the shower, and won't be slick or hazardous. Just remember to caulk the edges of the floor well, to make sure that no water can leak under the floor. Also, clean up standing water or puddles as soon as you see them, to prevent damage or warping.
i'll be using it in our new bathroom and other areas when they're ready for flooring.