We really enjoyed our stay at Rachel's apartment for the Hogmanay celebrations. It was unbelievably located and within minutes walking distance to the Royal Mile or Princes Street.
Accommodation was cosy and quite spacious, clean and presentable and the bathroom was a really nice size. Bed was OK (but a bit too soft for us as we like a really firm mattress).
Overall it was a great stay and would highly recommend to any one who wants to stay slap bang in the centre of the Old / New Towns of Edinburgh.
PS. If you are light sleeper take some ear plugs as it is right next to a main road.