You'll be hard-pressed to find a better-located place, let alone one with a more amazing view than this!
You've seen the photos--yes, it really is that close to the castle! Better yet, we walked EVERYWHERE from here. Old Town, New Town, even to, up, and from Arthur's Seat. Lynne is a wonderful host. She sends lots of information and is responsive and receptive to questions.
The flat itself was very clean and comfortable--cozy bedroom, perfectly suitable shower/bathroom, and a nice kitchen and living area to relax in after long days of sightseeing. Although there were lots of other flats in the building, we didn't hear any noise.
I definitely recommend staying here if you can get a spot!