Which HK Airport Express bus can take me with my luggage to Austin road, Kowloon from HKIA?

Well, no direct HK AE bus can take you to Austin Road directly. You need to take AE and MTR. Thus upon landing, you can take bus no.A22 at Airport (Ground Transportation Centre) and get to Chi Wo Street, Jordan Road. The duration is about 40 mins. And the ticket fare is 39 HKD per person. After arriving, walk southwest around 250 yards to find the Austin Metro Station. :)