You should explain to the traveler that it’s safer to book through the website.
Indeed, thanks to the safety and the verification system set up by Yestudent, the transaction is guaranteed.
For your safety, you should avoid giving any personal informations while your discussion with the traveler.
The traveler will have access to your personal informations (phone number, e-mail address, postal address) after the payment of the booking, so you'll be able to organize yourselves better.
You should know, that by completing the booking through the website, if the traveler cancels the booking less than 48h before the beginning of the trip, you receive a compensation.