Downstairs seriously disturbed our rest. I want to write a note to remind him how to write.

Hello, I'm an upstairs resident. I'm sorry, the purpose of writing this note is because I live upstairs and feel the noise downstairs all day.

Your voice has seriously affected my rest, because as a public place, there are many people who go to work and study around, so I hope you can pay attention to your noise. Can you control it a little and pay more attention at ordinary times? In this way, everyone's neighbors can understand each other. I hope you can control it in the future, thank you for your understanding, and then I am very sorry. I hope you can understand if I disturb you.

With the above content, you can write it as a note to your downstairs residents.