How to get to Chung King Mansion from Hong Kong International Airport?

The transportation is quite convenient. It is suggested to take bus no.A21 from Airport (Ground Transportation Centre) to Middle Road, Nathan Road. It takes around 70 mins. And the fare is 33 HKD per person. Afterwards, walk northeast around 50 yards to find the destination.

Thanks Lillian from France for the answer. However, I would like to know further details as follow:
(1) Does the Bus driver speaks English ?
(2) Any announcement make on every stops along the route to the destination ?
(3) Can I pay the fare of $33HKD by Octopus card or must pay by cash ?
(4) If pay by cash, must i pay the exact fare or the driver got change ?
Thank you
Scorpion
Singapore

1. English is widely used in HK. Thus, most bus drivers can speak basic English. Don't worry.
2. I remember that there is announcement make on every stops.
3. Yes, you can pay the cash for the bus ticket. You don't need to pay the exact fare. The driver will return the extra money. But you'd better prepare some loose change. :)