We loved our stay at the Grand Mercure on Renmin Square. Our only regret was that it was just 1 night. We took a sleeper train from Beijing to Xi'an. The train station is just blocks away from the Grand Mercure. As you exit the train station, the taxi pickups are on your right, and you would just walk straight, go under the wall and a few more blocks bring you to Renmin Square. The Sofitel is on the corner, you turn right, go through a gated entrance, and walk around the square until you get to it. We grabbed a taxi from the train station. He claimed he didn't know where the Grand Mercure was and wouldn't call anyone. He knew where the Sofitel was, so we had him take us there and they kindly directed him around the corner. No big deal. Only 20 RMB. Have the name printed in Chinese so you can just hand them that.
We walked back to the train station and caught the tour bus to the Terra Cotta warriors. Do your research so you know what bus to get on. The buses are on your right as you are facing the train station.
The next day, we walked to the wall and walked around on top of the wall that surrounds the old part of the city.
The Grand Mercure was beautiful and clean. We had a king sized bed that was soft. The breakfast was the best we have ever had in China. It was so conveniently located for easy walking to the train station and the wall. I would and will definitely recommend this place to future travelers who want to see the warriors and walk the old wall.