In Hyperion, the character Martin Silenus is rich enough that he lives in a novelty palace where all the rooms are connected by teleporters. As a joke, the bathroom is a wallless raft on an ocean world.

Outside of the realm of science fiction, my sister followed a TV show for a while that was basically a set of advertisements for a modular home company. One episode featured the installation of a small home on a remote British island; the shower was a pipe outside the house itself.