This depends on what kind of people live there. If it is an elderly person, it is best to go to the second or third floor. If there is no elevator, it is inconvenient for the elderly to climb stairs. If they climb too high, they may be injured. There is danger. For young people, the second to fifth floors are fine, because the first floor may encounter problems with littering and things, which is unsafe and unhygienic. The sixth floor is the top floor, which has the problem of being warm in the summer and cool in the winter.