My family (2 adults and 2 teenagers) stayed in Jack's flat during a long weekend in Edinburgh. We had a great experience: the flat is beautiful, renovated, all rooms are very nicely decorated and comfortable. We spent quite a lot of time cooking and having breakfast and dinners, and the kitchen was very well-equipped.
The flat is well-connected by bus to the old town, or, if you don't mind walking, you can even go by foot, it is not so far away.
We do recommend it without a doubt, and we hope we can come back soon.
Jack and his family were always helpful and communication was excellent.