Can I catch airport express to Courtyard By Marriott near Connaught Rd West. How much in A$

Yes, you can, but upon your getting off from the train, you have to transfer to a bus or taxi to your hotel then. By Express Train to HK Station. Then walk to Pottinger Street, Connaught Road Central to take bus no. 18, 18P or 18X to get off at Connaught Garden, Connaught Road West. After that, walk to your hotel. Train fare is 100HKD and bus fare is 3.8-4.6HKD.