front desk 
Customer reception area where reservations are taken, room keys are given out and hotel bills are paid.
elevator 
Mechanical apparatus with a car that provides automated movement of people between the levels of a building.
cocktail lounge 
Room where alcoholic beverages are served for a fee; people can sit at the bar or on couches around low tables.
janitor’s closet 
Room for storing cleaning products and housekeeping supplies.