2 of us stayed here for a long weekend. The flat was clean, spacious and well equipped. There is a dishwasher and washing machine in the kitchen along with supplies of dishwasher tablets etc. We had plenty of hot water, the shower was great, the bed was comfortable and the building and area were quiet.
It's only a 5 min walk to Holyrood palace and the royal mile so a fantastic location.
There is no direct view of Arthur's seat from the lounge you have to go right up to the window and look right to see it. But the view over Edinburgh is nice enough and I would happily stay here again.