Please provide best travel option from Hongkong International Airport to Royal Plaza Hotel Mongkok?

You are suggested to take Airport Express and transfer to Tung Chung Line at Tsing Yi Station, and then transfer to Tsuen Wan Line at Lai King, get off at Prince Edward Station from B2, and then walk east along Prince Edward West for 10 minutes and turn right, walk south for 3 minutes, you will get there.