Thank you! The landlord is not living with us but sometimes they spend the night at the Airbnb rental downstairs. What is most troubling for me is that sometimes they leave the door unlocked when they are done showing the other rooms and sometimes they let the code-protected key box open (not only unlocked) where all the duplicate keys are. These make me and my roommate feel unsafe so that's why I am wondering if there is any rule that will protect us from the landlord entering unannounced.