The flat is in a great location very close to everything - great restaurants, Edinburgh Castle, Greyfriars Kirk, Royal Mile, etc. The location couldn't be better, but with that comes noise. There are bars and hostels below, so strongly recommend bringing ear plugs.
The beds are comfortable, kitchen is well stocked, livingroom is comfortable. The listing indicates there are stairs -- there are definitely stairs! Quite a few to the flat and then to the top floor where 2 bedrooms are located.
The management company was responsive to issues we encountered while staying in the flat, and tried to find resolutions.