换了三次房才懂：这3个楼层，不好住也不好卖，懂行的人都在悄悄“脱手”

Core Viewpoint - The article discusses the hidden issues associated with different apartment levels, emphasizing that cheaper options often come with significant drawbacks that may not be apparent initially [1][13]. Group 1: Apartment Level Issues - Living directly below equipment layers can lead to persistent low-frequency noise, especially noticeable at night, which can disrupt sleep [1][10]. - Residents in lower levels often experience issues such as mold and water damage due to poor construction, particularly in waistline layers [4][6]. - The next-to-top floors may seem appealing for their views but can suffer from heat and noise from rooftop equipment, as well as potential water leakage problems [7][9]. Group 2: Recommendations for Homebuyers - It is advised to visit potential apartments at different times, especially during rain and at night, to assess noise and odor issues [12]. - Choosing middle floors can provide a balance of light, noise control, and temperature management, making them a safer long-term investment [10][12]. - The article suggests that the initial savings on cheaper apartments may lead to greater long-term inconveniences, highlighting the importance of careful selection [13].