Hello, how can I go to Days Inn Forbidden City, Beijing. The address is No. 1, Nanwanzi Hutong, Nanh

I'll arrive at Beijing capital Airport and I want to go to Days Inn Forbidden City, Beijing. The address No. 1, Nanwanzi Hutong, Nanheyan street, Dongcheng District,Beijing, China,100006. How do I get there using airport express train?

Thanks