My family and I just wrapped a short stay at Karen's flat. She describes it honestly - 80 steps up in a 125 year old building. Be sure to keep this in mind if you're not up to it or traveling with a lot of luggage.
However, as the saying goes in real estate...location..location.. location, and this property delivers. You are right in the heart of things..steps from Grassmarket and The Royal Mile, and the views of Edinburgh Castle never grow old. Karen was super responsive to all of our queries and concerns.