We visited Xian and on the tour saw the Terracotta warriors and the city wall. Our guide was Jackie. He was great helped us see everything and explained everything in great detail. Would highly recommend him for tours in this area. He was also flexible in that the hotel we originally booked we found out didn't exist (thanks hotels.com). But we booked one on the fly when we got there, and he was accommodating of the last minute changes to the pickup location.