More popular in European countries, these rooms maximize a small bathroom footprint. If you’ve ever had a sleeper car on a train, you know how this works. A separate shower stall is not required and everything in the room can stand up to the water.
Speaking of tiles, if you’re going the more traditional subway tile route, think about going with a beveled edge, as on the marble wall tile here. It adds just a bit more dimension and character to take a room from typical to dynamic.