When I bought my house it was listed at 5 bedrooms. There are 3 bedrooms upstairs. I think the Master Bedroom (first floor) is actually supposed to be the living room, and the living room was a dining room.

The fifth bedroom is a room in the back of the house just off the driveway. It's uninsulated, the window is single pane, and none of the outlets are grounded. It's unheated. They had a scrap of carpet out there, but it was just covering the cement floor. I installed an insulated exterior door and threw away the solid wood one. I keep the lawn mower and snowblower out there.