What is the best transportation from Hongkong airport to crown plaza Kowloon East?

You can take bus no. E22A at Airport (Ground Transportation Centre), and get off at Tseung Kwan O Station, Po Yap Road. It takes around 1.5 hours on the way. The ticket fare is 24 HKD per adult.
Then walk to the east along Po Yap Road and walk to the north along Tong Chun Street. After that, turn left and walk along Tong Tak Street. You will find the hotel is on your left side.