From Hyperion by Dan Simmons:

    My home has thirty-eight rooms on thirty-six worlds. No doors: the arched entrances are farcaster portals, a few opaqued with privacy curtains, most open to observation and entry.

    ...

    The architect, a student of the legendary Millon DeHaVre, has incorporated several small jokes into the house’s design: the steps go down to the tower room, of course, but equally droll is the exit from the eyrie which leads to the exercise room on the lowest level of Lusus’s deepest Hive, or perhaps the guest bathroom which consists of toilet, bidet, sink and shower stall on an open, wall-less raft afloat on the violet seaworld of Mare Infinitus.