Stair rooms have floors 5 and 6, and the living life of the house can reach at least 50 years, so the quality of the house is relatively guaranteed.
Climbing stairs for a long time increases human movement. There is an old saying that you can live for 99 years by walking a hundred steps after a meal, and exercise is essential. If this kind of house has two households on one floor, most of the units will be transparent from north to south.