If a strange room was the main feature of your dream, the meaning depends on the action and other elements which should be considered, but as a general guide: To enter a strange room is a warning that a casual affair could turn out to be an incubus if you aren't careful. To find yourself in a strange room signifies sudden success if it was reasonably well-furnished, and legal troubles if it was empty or only partly furnished. If the room was a very small one, it indicates a lucky last-minute escape from a regrettable mistake.