Pests
You keep finding them. In the kitchen, under the sink, along the wall at night. You clean, you close the food, and they are still there. The place does not feel fully yours anymore.
Say what you found, where, and how often. Say if neighbors have the same thing. Add the address. Plain words are enough.
A draft can consider a letter to the owner and a city note, from official files only. This page names the problem. It does not decide that a rule was broken. You decide what to do next.