You can take bus 611 and get off at West Street (Xi Da Jie). The pick-up point is in front of Xian Long-distance Bus Station opposite the west part of the railway station square. A lot of people waiting for bus around there. You have to walk a few minutes to the hotel after dropping off at West Street. My suggestion is walk to your right side when you get out of the exit of Xian Railway Station. You can find taxi parking lot. Take taxi to your hotel (show Chinese name 馨乐庭城中服务公寓 located in竹笆市, near by the Bell Tower). The taxi fee should be no more than rmb20.
The trains from Beijing stops at Xian Railway Station, the one in the downtown area.