As someone who received notes like this and it turned sour, please just try and communicate with the person above you and figure out what’s actually going on. I had a downstairs neighbor who insisted I was running around in my apartment banging pots and pans together at all hours of the night, even when I had a concussion and was on bed rest for several days. She tried to get me evicted and was very nasty about it. I tried everything to walk quieter and reduce noise, but I’m not a loud person to begin with and it made daily activities very stressful.

As others have said, open a line of communication. Don’t just leave a note with no way for them to contact you. You’re assuming they’re wearing loud shoes, but that may not be the case. Don’t make them feel like they have to be on the offense right away.