I think this would be a relatively straightforward explanation. Correct me if I'm wrong.
Privacy - whether your door's keys are given to someone.
Anonymity - whether or not someone can see what's behind your door.
Security - whether or not your door is locked and has alarms.
Good & Bad practice examples
Good privacy: people can only enter and leave your door with your consent.
Good anonymity: people don't know what's behind your door.
Good security: people can't break in easily, and if they do, you know.
Bad privacy: adversaries can enter and leave your door without your consent.
Bad anonymity: adversaries know what's behind your door.
Bad security: adversaries can break in easily, and if they do, you don't know.