Not instantly, but you can send a booking request using the booking form on the right-hand side of the listing. When you submit your credit/debit card or PayPal details, the payment will be pre-authorised. It will not be taken from your account until the owner accepts the booking. Bookings must be accepted (or declined) within 24 hours of your request.
It's very rare for owners to decline a booking, but either way, we'll e-mail you to let you know.