Myself, my brother and two friends visit the Fringe every year but this was pur first AirBnB and we couldn't have been more impressed with our experience. Jack's apartment is a stone's throw from the Castle so you're right in the thick of things, but due to its height above street level you escape the bustle very quickly. Everything you could ask for is on your doorstep, the train station is at the end of the road, the Mile is right at your back, it's perfect.
Jack left us a small welcome gift that was well received and while we didn't need much help with regards to the festival, Jack provided information booklets and can offer advice on the area. A very good host and gentleman who was very easy to deal with so if you're going to be in Edinburgh and need a place to stay I'd put this at the top of your list!
I could go on and on but ultimately I couldn't recommend Jack and his apartment highly enough.