If a strange room was the main feature of your dream, the meaning depends on the action and other elements in the dream, but as a general guide: to enter a strange room is a warning that a casual affair could turn out to be very dangerous to you if you aren't careful. To find yourself in a strange room that is elegant and well-furnished signifies sudden success. A strange room that is empty or badly furnished could suggest legal or financial troubles. If the room was very tiny, it symbolizes a lucky last-minute escape from a bad mistake.
To dream of opening a door and going into a room is a warning not to trifle with the affections of one of the opposite sex. If the room is furnished, the omen is that someone will be jealous of you; if unfurnished, you are likely to be sued. If you dream of occupying a small room and being slowly suffocated you will have a narrow escape from a major catastrophe.