Hi mate,
I hope you have a good time in HK!
As for accommodation, the hotels/lodges on Lantau are relatively bike-friendly, but are rather basic. They are also really only suitable if you want to restrict your riding to Lantau, as it's not terribly convenient to from Lantau to all of the other places with good trails (including Tai Mo Shan).
I think the best person to ask as regards both questions would probably be bikesteve (aka Steve Coward) of CrossCountryHK, who should be able to sort you out.