Toilet has an open and easily accessible ventilator. A door viewer. A working phone. Working air conditioning system. Fire alarm system.
Intruders don t generally enter the occupied rooms.
Before you leave your room, turn on the TV or Radio, loud enough to be heard outside your room. Keep all curtains drawn on windows that provide unhindered view of your room from outside. Use the door viewer before you open the door for anyone. Arrange your belongings in a fashion that will tell you if anything is missing. Look on the phone to see how to report emergencies.