We loved our stay here during Edinburgh Fringe. We were 2 couples and 2 infants. The flat was incredibly spacious, more so than the photos show. Everything worked as expected. The company acting as hosts were prompt and great to talk with during the build up, even answered the phone quickly!
Worth noting on parking - there is plenty on street parking nearby that runs from Monday to Friday 8:30-5:30. Saturday and Sunday were completely free when we were there. When it is chargeable it's not cheap but it is convenient.
It's a quick and easy 20 minute walk from here to Bristo square and then onto the city centre.