There is a high probability of finding furniture in a random room at doors:
Furnitures
Conteiners: There is a high probability that there will be money or goods in the containers. There are 8 different types of containers.
Armchair: There may be keys on the armchair. But it was probably added as decoration for the game so that the hotel wouldn't be empty.And when we crucifix Seek, we can see that Seek is sitting on a armchair on the photo side of the take a breather achievement.