Fantastic location just on the Royal Mile. Lovely views from the windows - Arthur's seat and Carlton hill.
Lots of cafes and shops within a few minutes walking distance.
The apartment itself is lovely. Rooms are comfy, with lovely little touches - tartan pillows and lots of books.
My only quibble - I've a very light sleeper and the clock tower across the road chimes every hour!
But otherwise, I would recommend this place for your stay in Edinburgh