Put the note where the problem is. A pin on the pendant says more than "the light on the left". If the problem is an area, draw round it.
Say what you want, not only what is wrong. "Too dark" starts a guess. "Bright enough to read the sign by the door" ends one.
One change per note. Three requests in one comment tend to come back with two done. Separate notes can each be resolved, and each is checked on its own.
Talk when typing is slow. The microphone in the comment box turns speech into a note on the spot you picked, which is often faster and more precise on a phone.
Compare before you approve. The slider shows what moved between rounds in a second, and the check marks which of your notes were addressed. Approve when both agree.