How to get to Hong Kong Island from HKG?

Yes, it's located at HK Island. Fom the airport, you can take airport express to get to HK Station directly.
What's your budget about the accommodation?
Best Western Hotel Causeway Bay is a good choice for you. The price is about 620 HKD per night. It provides good environment and warm service. And the surrounding transportation is convenient. The hotel is located at Cheung Woo Lane, Canal Road West, Causeway Bay, Hong Kong.
About the transportation to this hotel, you can walk to Central Station from HK Station first. Then take Island Line to Causeway Bay Station, Exit A. After that, walk west around 275 yards.