I did a one day private tour to the Great Wall and the Forbidden City. Excellent service from the moment I was picked up at my hotel. My guide spoke very good English and was very knowledgeable about the history of China. She was also great at taking photos and was so helpful when we were shopping. She negotiated down the price for me! All in all a really good service and I would have no hesitation using then again if I get a chance to come back to Beijing.