Andy is a phenomenal host, and the location is great. I cannot recommend him highly enough.
First of all, Andy is very familiar with the city. He can recommend all sorts of interesting cultural events and activities. Also, he is really thoughtful and friendly, and does his best to make sure that his guests have a great time. He keeps the amenities clean and neat, and will bend over backwards to make sure his guests have a great time. He is very communicative, and I found that he responded to everything in a very short time.
The location is amazing. You are really in the midst of everything, but in a quiet corner so you won't be woken up in the middle of the night from loud noises outside. Getting to any tourist attraction from his place is a matter of a short walk.
I certainly plan to stay there again next time I am in Edinburgh.