Which the best and most economical way to go between Xian international Airport and my hotel?

We are arriving at the airport around 20:00h and my hotel is the Citadines Central Hotel, address: 36 Zhubashi, Beilin District. I've heard about there is a shuttle bus between the airport and the city center, what would be the line of this shuttle bus You suggest us? In advance, I thank the support of you.