Groups of 3 person from HKIA to AhShan's hostel? Kindly advise. Thanks

Upon landing, it's suggested to take airport shuttle bus no.A21 at Airport (Ground Transportation Centre) and get to Bank Centre, Nathan Road. The duration is about 50 mins. And the ticket fare is 33 HKD per person. After that, walk northeast around 250 yards to find the hotel. :)