Dress in a suit.
Keep calm.
Speak when spoken to.
Don’t volunteer too much.
Be yourself (unless you are a dog-breeding rock star).
Small co-ops: be enthusiastic about helping with the chores (garbage, cleaning, etc.)
Prepare to be asked about your job, finances, large credit card balances, or other liabilities.
Don’t lie outright, but of course, you don’t like loud parties, being awake after 8:00pm, doing construction ever, or even walking in shoes in your place.