Leaving in just 2 days, and finally looking at the nitty-gritty details of getting from A to B!

What do you all feel would be the best way to get from the airport to the City View (formerly YMCA Int'l House). Our flight from NRT lands at 2200, and hotel website makes it look like the K6 bus won't be operating by the time we would get to Kowloon station if we took the airport express train.

1. If we did the train, how would it be to get to the hotel at that time of night (after 24+h of travel)?
2. How long does the A21 bus take?
3. Has anyone done the airport shuttle service (HK$120)? How is it, and how long for this one?

Thanks a lot!!!