The location of Martin's apartment is really great to visit the city, close to the Royal Mile, Grassmarket place and its pubs and restaurants. We liked the view on Greyfriars Kirkyard.
It's very quiet and yet close to everything. It was also very clean. The only thing to improve would be the beds, the mattresses aren't very comfortable, although they were good enough for 2 nights.
We also appreciated the big map of Scotland and the various guides of Edinburgh.
We would definitely go back !