As many other reviewers have noted the apartment is spotlessly clean and very comfortable. Just as important is it's location - we had never visited Edinburgh before and I was relieved to discover that the apartment really is in a very good position about 3 minutes walk from Waverley train station on the way to the Royal Mile, yet is situated on a comparatively quiet street, making a good night's sleep very easy.
Martin himself was an excellent host, giving clear and helpful tips on things to see and do. We will definitely visit again.