designating a room, apartment, etc. that is not provided with hot water or, sometimes, a bathroom: a cold-water flat
See cold-water in American Heritage Dictionary 4
Discouragement, deterrence, or deprecation, as of a proposal or an idea deemed silly or ill-advised: “The President was careful not to throw cold water on the latest Soviet arms proposal”(Christian Science Monitor).
Lacking modern plumbing or heating facilities: a cold-water flat.