Yes, easy to find the taxi to the hotel. You can get off at Chung On Street and then walk to the hotel along Tsuen Wan Market Street.
To Cheung Chau Island: walk to Tai Wo Hau MTR station to take metro to Lai King then to Tung Chung. The Citygate is connected with TUng Chung Station. Take bus 11 at TUng Chung Bus Terminus to Tai O. Take Bus 3M at Tung Chung to Mui Wo Ferry Dock. There are ferry to the island.
To Stanley Market: Take mtr from Tai Wo Hau to Central and take Bus 6A to Stanley Market. No. Pier in Central also have ferry to Cheung Chau ISland. There are more ferry ships daily but takes long time.