This apartment is in a great location. Turn right out of the front door, walk up about 50 steps and you are slap bang in the middle of The Royal Mile (or High Street). There you will find all manner of shops, restaurants, and things to do. And you can be at the castle in about 7 minutes walking time.
The apartment is fine and is all about the location. There is a double bed in one bedroom but the second bed is only a 3/4 double so would be snug if there are two of you. I have provided feedback to the management company about where they could make small improvements. If you want a base in the heart of Edinburgh, then this is for you.