how to get to the Waterway Hotel Spa from Guangzhou airport.

what is the best and easier way to get there? and how do i get there?
which is better airport shuttle bus , or metro train? which route do i take..
another question, how do i pay for the different transportation? is there a location in the airport i go to?

the Waterway Hotel Spa is located at
163 South Donghua Road (Donghua Nan Lu

thanks for everything.... bye....