recycling
If recycling is important to you, keep in mind that your au pair does not automatically know this. Explain in the house rules if you recycle and how. Use pictures to explain your recycling system.
This way, your au pair will definitely understand, even if there are still some language problems in the beginning. In many households, the au pair is responsible for taking out the garbage. If you want your au pair to do this, make sure to attach a schedule for the garbage pick-up to your house rules.
Cleanliness and hygiene
What is considered clean is different for each person, and sometimes there are cultural differences as well. For example, if you want everybody who comes into the house to take off their shoes, write it down in the house rules for the au pair.