What will be the Taxi fare from MONG KOK Station to ANNE BLACK-YWCA HOTEL at Waterloo ROAD HILL?

Since my booking is at Hotel ANNE BLACK-YWCA , Waterloo Road Hill , KOWLOON. After getting down at Mong Kok Station by Airport Bus A-21 if I catch a Taxi to my Hotel , What will be Taxi fare appx. ? Will you please guide me ? Thank you in anticipation.