We loved staying at Claire's flat and thought it was one of the nicest Airbnbs we've ever stayed in!
The decor was very nice and the flat very clean and spacious with everything we needed. It took us about 15 minutes to walk in to Old Town, with lovely restaurants and cafes along the way (we visited a bakery which was particularly nice).
Overall, we loved our stay at the flat (and Edinburgh itself) and can't wait to come again!
P.S. - we'd recommend not bringing a car if you come to Edinburgh as we found it to be more of a hassle than it was worth with parking, and it's easy to get around without one.