In Japan rooms are divided by layout type : 1K, 1R, 1DK, 1LDK, 2K, 2R, 2DK...

Japanese apartment layout are usually very similar, there isn't a huge diversity.

1R 1 room non separated with the kitchen. (1 Room)

1K  a kitchen + 1 room  (1 Kitchen)

1DK a dinning/kitchen room + 1 room  (1 Dinning Kitchen)

1LDK  a dinning/living/kitchen room + 1 room (1 Living Dinning Kitchen)

 

2K  a kitchen + 2 rooms (2 Kitchen)

 

2DK a dinning/kitchen room + 2 rooms  (2 Dinning Kitchen)

2LDK  a dinning/living/kitchen room + 2 rooms (2 Living Dinning Kitchen)

3LDK a dinning/living/kitchen room + 3 rooms (3 Living Dinning Kitchen)

                 

                      ...

japanese layout, 1 R , 1 room
japanese layout, 1K , 1 kitchen
japanese layout, 1DK , 1 Dinning kitchen
japanese layout , 1LDK , 1 living dinning kitchen
japanese layout , 2K , 2 kitchen
japanese layout , 2DK , 2 dinning kitchen
japanese layout , 3LDK , 3 living dinning kitchen
japanese layout , 2LDK , 2 living dinning kitchen