@Stephanie35 the Security Deposit is not charged to the guest when making a reservation. Also, I've been told by Airbnb that they do not place an authorization or "hold" on the guest's credit card. Airbnb keeps the credit card information on file for a short period of time in case the host needs to make a claim for damage / broken items and the like.
As to your question about what your guest has been charged, he should see a breakdown on his itinerary for all the charges. Also, when he made the reservation request he should have seen these same figures. Here's a help guide on this subject:
https://community.airbnb.com/t5/Tips-Tricks/How-Much-Does-a-Guest-Pay-A-Community-Help-Guide/m-p/246...
If applicable, VAT taxes, hotel taxes, cleaning fee and the like are itemized for the guest. You can also see the breakdown of the costs by "pretending" to make a reservation for similar dates with the same pricing. You will see all the charges itemized.
Hope this helps you sort things out!