I have stayed at this Sheraton several times when visiting Xian and have never been disappointed. The rooms are up to Sheraton quality standard and restaurants serve a wide variety of western/chinese foods. It is located just outside the city walls so the traffic is not a hectic as found inside the city walled area.
The gym is set up with a good selection of treadmill, bike, and free weights which you can get a decent work out in the morning. There was no swimming pool and the sauna/spa was only open in the afternoon.