I think this is not an ideal situation. As a home owner who lists my property on AirBNB, I am making my decision to rent my home based on the reputation and credentials of the person who is actually suppossed to be booking and staying at the property. If you are "fronting" the reservation for someone else you run 2 risks:
1. The person that you are posing for is not trustworthy and they tarnish your reputaton. If they break the house rules or act in a manner inconsistent with the expectations of the house rules, you will be the one we will seek compensation from and you will be the one to get a poor review and possibly - kicked off of AirBNB for violating the terms and agreements of the service - not your friend. And your defense that "it wasn't me", simply won't cut it.
2. This violates the trust of the system that AirBNB sets up - by asking identities to be verified and reviews to be written, we are suppossed to be able to trust these things. When you represent for someone else, you are impuning this trust.
Honestly, if I found out the person renting my home was NOT the person who booked it, they would be asked/forced to leave and you would be liable for the payment in full.
K