We stayed in Rowan and Wil's place for our first family trip with our 7 mo daughter. We could not have asked for a better place. The flat is very spacious, clean, quiet and tastefully decorated with all the appliances once might need. They also provided a high chair for our daughter which was big help. The flat is not in the heart of the city but is walking distance pretty much everywhere.
We would definitely recommend it if you are planning a trip to Edinburgh.