If you are looking for the most convenient and charismatic location this is it, and the apartment is clean, comfortable, and large to boot!
It was fabulous to have king size beds and modern clean bathrooms, but our favorite part was opening the windows and people watching and hearing the music coming from the Royal Mile - we loved it!
There are a lot of stairs to get to the apartment and within the apartment itself, so just be aware if there are mobility issues it may not be the place for you.
The kitchen was so well equipped and we did utilize the washer/dryer( some written instructions on how to use the machine would have been quite helpful though).
We slept so well, some light noise from the street below, but not late in to the night, and the beds were very comfortable.
This is by far one of the biggest apartments we have enjoyed in Europe and the location cannot be beat. Communication was good, wish they had been a little more timely on our arrival as I sent many messages about our arrival time, but the man who greeted us eventually was nice and friendly.
Would highly recommend and would definitely stay here again!