Multi-storey residence with a total height of 6 floors. Which floor should I buy and why?

It depends on what kind of people you live in. If it's an old man, it's best to be on the second and third floors. If there is no elevator, it may be dangerous for the elderly to climb the stairs too high. If you are young, you can go from the second floor to the fifth floor, because the first floor may encounter the problem of littering, which is unsafe and unsanitary. The sixth floor is the top floor, so it will be warm in summer and cool in winter.