Bus connection to Guangzhou from Hong Kong airport

I will arrive on
Friday June 20th, 14:40 at Terminal 1, HK International Airport
and need to go to Westin Hotel, Linhe Middle Road, Tainhe, Guangzhou
I would appreciate, if you could help me with a bus connection. I'm a bit confused by the many operators and their Chinesise homepages.

Many thanks

Silvia (Minich, Bavaria)