We had a wonderful stay in Lynne's flat. The location was perfect - we walked everywhere and had no need for a cab/bus - very central to everything.
The apartment was incredibly clean and comfortable. Lynne was nice enough to bring us milk for our coffee in the morning and gave a few suggestions of things to do and see while in the city.
The only item to note would be that the central location did account for some late-night noise. The only night we went to sleep before 11pm, there were still people out and about (it was a Friday night, though, so it was understandable).
Overall, great stay - would definitely recommend to anyone looking to get the most out of only a few days in Edinburgh.