This is one reason why I do not use Instant Book. If you have your settings so that you can chat with the guest before accepting any booking you can clarify issues like this. Message this guest and ask them to clearly state their address, then do a Google / reverse phone lookup search to check details. If you are not happy with the result telephone Air BnB and ask them to resolve the booking for you.
Visit https://www.airbnb.ca/help/contact_us
From the bottom of the screen, choose either “My question is about something else" or "I have a different issue.” Follow the prompts to figure out what best describes your issues. Some things you choose will take you to specific information whereas others you can fill in the text box and submit your question.
If you tick the box about hosting and then choose for safety matters, you get the possibility to speak directly with someone from AirBnB in a chat box.
When you submit a question, you can expect an answer back from a Community Expert within five minutes but usually less. If the Community Expert cannot help you, they can re-route your issue to Airbnb who will then contact you. Airbnb Community Experts do not have access to your account information so if it is a question that can only be answered with account information, they will re-route you automatically. Airbnb Community Experts are available 24/7 and again, usually you will have an answer from them within minutes. USA is +1 (415) 800 5959
Cheers and good luck,
Carolyn