Beijing South Railway Station to my hotel is at Dong'anmen Avenue, Dongcheng District

Hi, I will be in Beijing thru Tianjin on 8 July 2011. My hotel is at Dong'anmen Avenue, Dongcheng District... How far is the hotel from Beijing South Stn and how much does it cost to take a taxi. How about the subway? do you recommend me to take the subway to the hotel. Thanks.