How to get to 22,Shanxi Xiang, Qianmen from the Beijing airport?

I will be arriving in Beijing at Terminal 2 and to go to my hostel at 22,Shanxi Xiang, Qianmen. I have to take the express train from T2 to Dongzhimen then change to subway line 2 and stop at Qianmen and how far from the subway at Qianmen to my hostel? Can I walk or have to take a taxi ? How far to walk to my hostel. If I take a taxi how much it will cost me ?Thank you.