I contacted Sam one week before my trip. He was very responsive and before arriving to Cambodia we arranged for airport pick up and drop off, a half day tour the first day ended with a great dinner/entertainment experience at a restaurant and a full day tour the second day. The service was extremely friendly and knowledgable. Our guide, Sun, was very accommodating and spoke English well. I have already recommended Sam's service to two others. I do not hesitate to recommend this guide.