Thoeun is the best guide in Angkor. We stayed in Siem Reap for about four days, but wish we had stayed much longer. Thoeun is terrific, he can answer any and all your questions about Angkor Wat's history and anything you want to know about the temples there. He has become a great friend also. He listens and caters your trip just the way you want it. His drivers are safe and professional as well. He has over 10 years of experience.
Thoeun has worked with the Greater Angkor Project, which is an Austriaian-French-Cambodian archaeological team that has been investigating the fall of Angkor for many years. Thoeun has worked with this group for many years, and the knowledge he has obtained from working with them is priceless. It makes him the best guide as he has very knowledgeable about all aspects of the temples and history. His hands on experience means he can take you to places that other guides do not know of or know anything about if you so desire. A lot of Thoeun's knowledge is not any guide book, which makes him the guide you should hire.
Thoeun has his own pre-made schedule if you prefer for 1 day, 2 days, 3 days, and beyond. If you prefer to arrange your own schedule, you can let him know in advance and he will accommodate your needs to the best of his abilities. The best thing to do is to write him in advance and tell him what you want and when you will be there. You also should book him in advance because good guides are hard to find in Angkor. We were very lucky to have gotten him. When he is giving you a tour of the temples, if you feel he is spending too much time talking, you can also just mention it to him, he will listen and shorten the history the best he can, but honestly a lot of the history is very fascinating and you should not be rushed to visit the temples.
If you are wondering if you need a guide for Angkor or not, I say yes, you need a guide, pay the extra money and hire a knowledgeable guide, like Thoeun, because it will truly enhance your experience while there. While walking around the temples we overheard other guides in Angkor telling visitors things that just did not make sense to us, we then asked Thoeun about the things we heard and he helped us to understand in more depth and detail about what we had heard and to correct what the other guides were staying. Thoeun really is a wonderful guide and will always do his best to answer your questions.
Thoeun's English is impeccable; you will not have any difficulties understanding him.
You can check out his website for more information.
If you have any questions please feel free to ask me also. I highly recommend his services for anyone serious to know more about Angkor Wat's history and who wants a great guide.