You could not find a better location in Old Town Edinburgh, or a better host. The sights within a 15 minute walk are too many to list. The restaurants right near the flat are excelent, varied, and in the full range of cost. The bed is close to king size and very comfortable. We were here in July and had no problem with street noise in the master bedroom.
The only negative is that the stairs to the flat can be chalanging, especially for the mobility impaired. Contact the host to discuss this when you are looking to book.