The flat is very nice and close to everything. We already knew our way around Edinburgh, but feel confident you will find pretty much all the sight seeing places at a walking distance, especially during the festival. The flat itself was very clean and very well taken care of (don't be scared by the entrance and staircase leading to the flat, as it is a very old building and hasn't been refurnished in a while, but this is very common in Edinburgh's old town buildings, once you get in the flat, everything is perfect).