Single: A room assigned to one person. May have one or more beds.
Double: A room assigned to two people. May have one or more beds.
Triple: A room assigned to three people. May have two or more beds.
Quad: A room assigned to four people. May have two or more beds.
Queen: A room with a queen sized bed. May be occupied by one or more people.
King: A room with a king sized bed. May be occupied by one or more people.
Twin: A room with two twin beds. May be occupied by one or more people.
Double-double: A Room with two double ( or perhaps queen) beds. May be occupied by one or more person.
Studio: A room with a studio bed- a couch which can be converted into a bed. May also have an additional bed.
Mini-Suite or junior suite: A single room with a bed and sitting area. Sometimes the sleeping area is in a bedroom separate from the parlour or living room.
Suite: A parlour or living room connected with to one or more bedrooms.
Connecting rooms: Rooms with individual entrance doors from the outside and a connecting door between. Guests can move between rooms without going through the hallway.
Adjoining rooms: Rooms with a common wall but no connecting door.
Adjacent rooms: Rooms close to each other, perhaps across the hall.