We stayed at Gary's place while visiting Edinburgh for a weekend. The location is easily accessible to/ from the city proper (about 30 mins or less via public transit), as well as the Edinburgh airport. Gary's apartment is steps away from great bars and restaurants, as well as a few small grocery stores.
Gary was very welcoming when we arrived-- his place is as tidy and pleasant as it appears in the pictures. He offered us tea, coffee, and cereal, and had plenty of recommendations for things to do both in the main parts of Edinburgh and charming Leith.
One thing to watch out for... we developed an addiction to Tunnock's tea cakes after Gary left one for each of us as a welcoming token. (Like when hotels leave a mint on your pillow, only much better.) Definitely recommend that you stay here if you want to experience Edinburgh, but also crave a cozy and quiet temporary home.