Hotels are typically one of two things.

"City" type hotels: A big level with various places in it, called "rooms", with names above them indicating that these rooms belong to certain people. You get a room by asking the maker of the level. To make the level be more interesting, there will typically be also such features as roller coasters, pools, games, race tracks, and other random entertainment.
"EvilMike" type hotels: A big level, typically with several buildings in it. Each building will have several rooms of about medium size, which can typicallly be enlarged later. The level is filled with generating coins, and most of your time will be spent gathering coins. When you have enough coins, assuming there is empty space in the level, you can buy a room, and then later use more coins to furnish your room. Other possibilities include destroying other peoples' furniture or rooms, minigames or contests to win special awards, or banks where you can loan other people money.

"City" type hotels aren't hosted much anymore.