What precautions should I take when participating in Air B'n'B as a host?

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I'm thinking about participating in Air B'n'B as a host. I'm not really worried about my potential guest, otherwise I wouldn't participate. However, I want to take some precautions so that I don't get scammed or robbed or whatever. Today I thought about these precautions, but besides copying the passport and only accept guest with a good rating I couldn't think of anything else. Are there any more precautions I should consider?
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