Absolutely amazing.
First, you get a gorgeous view of Edinburgh Castle as you walk out of the apartment. You're located right in Old Town and it's super easy to walk everywhere.
The flat was great and very clean. Lots of space and it's on a quiet lane so you don't get street noise. Amenities and appliances were newer.
Lastly, the thing that absolutely made this a wonderful experience was Martin's hospitality. He was very responsive to questions leading up to our stay. He met us at the flat and walked us through the quirks of some of the appliances. As first time travelers to Edinburgh, we welcomed the recommendations and directions that Martin provided.
Definitely would highly recommend a stay with Martin and this flat!