@Carla1205 You do not want to rent for 8 months through Airbnb. There is no real security deposit, Airbnb does not do any background checks on guests, only the first month's payment is guaranteed, and if the guest then reneges on the rent, they have been in residence long enough to fall under landlord/tenant law and you can have a terrible time evicting them.
It doesn't sound like you listed in order to be a landlord, rather than a host. Take the short booking, if the guest seems like someone you'd want.
And be aware of the difference between an Inquiry and a Request. An Inquiry only requires a message back to the sender within 24 hours. Don't decline.
A Request requires that you either accept or decline within 24 hrs.