Mario Bros.' House
Mario's House is where Mario and Luigi live. It has been seen in games like Mario and Luigi: Superstar Saga and Paper Mario, and the details of the house change from appearance to appearance.
The log cabin is located in a remote part of the woods and seems to be only accessable through a pipe in Toad Town.
In Paper Mario, the house contained a bedroom with bunk beds, where Mario could rest to restore health; a small living room; and a secret basement where Luigi kept his diary.
The house changed in Mario and Luigi: Superstar Saga. It contained an upstairs bedroom (no bunk beds), a kitchen, living room, and a bathroom.
Mario's House was also featured in Paper Mario: The Thousand Year Door. It seemed to be similar to the Paper Mario version.