This is an extremely nice, modern, spacious, purpose built flat, that is obviously very well cared for and equipped. The beds were comfortable with two king-sized doubles with a smaller double in the third bedroom. While we didn't get to meet Gill and Robert, they were very responsive to my emailed questions with replies coming within the hour, so communication was very easy.
Location felt secure and well lit at night.
While not bang in the centre, Waverley station at the start of Princes Street is a 15 minutes walk away with Edinburgh Castle about half an hour away at the other end. Locally there is a Tesco and Sainsbury within 5 minutes walk (although the Tesco is being refurbished at the moment).