There are shuttle bus from Hong Airport airport to InterContinental Shenzhen in Hua Qiao Cheng, which is very close to your hotel then. The bus is operated by Eternal East Bus Company. You can buy the ticket at arrival hall. After getting off the bus, take a taxi to the youth hostel. Or get into Hua Qiao Cheng subway Station to the next stop, Hua Qiao Dong. Leave from Exit A and walk a few meters to yout hostel.