We stayed in Edinburgh for 3 nights in late May. The flat is absolutely lovely - clean, comfortable, charming, and quiet. Debbie was a great host, responding quickly to any questions, offering suggestions and checking in with us. While it is approximately 1.5 miles to the Castle and old town, of you don’t want to walk, the bus runs nearby and takes you right into old town and other areas quite easily.
We were driving and free parking was appreciated.
One thing to note - the flat is on the top floor and there are 3 flights of stairs (no lift). This wasn’t a problem for us, but if you have any mobility issues - be prepared.
Would definitely recommend this flat!