For those of you who are booking private tours for the first time, perhaps a little clarification would help. A tour driver and a tour guide are not the same. It is to your advantage when booking a private tour to be sure that you understand the difference and know in advance what you are paying for. A tour guide has a license, usually issued by the state / country. He or she has attended school to learn all about the sites you will see. A guide is permitted to go into the historical sites with you and tell you about the history. Naturally, their services will cost more.
A tour driver is not licensed, has not attended “guide” school, and is not permitted inside the site to tell you about the history. Naturally, their services will be more economical. Many drivers are just as well versed in the area history as the guides. The difference of course is that they have to tell you the facts before you go inside