Noun
double room (plural double rooms)
A room, especially in a hotel, that is designed for two people and has two single beds (sometimes called a twin room) or one double bed.
Instead of completely reconfiguring the Boat Deck, the ship's architects simply opened a well in the deck between what were to have been the second and third class lounges, creating a double height space known as the Double Room (now the Grand Lounge). Source: Internet