The location is excellent; it's close to local restaurants in Old Town and Grassmarket that serve some of the best foods we've ever tried in Edinburgh(Thanks, Doug for the recommendations!).
The apartment itself was outstanding-well-equipped, clean, quiet, warm, had an amazing view of the castle and such cool decor! We could tell how well-looked after their apartment is and we felt really lucky to have found and booked the place.
Doug is the best host, went out of his way to welcome us, made sure we knew where to go for the best meals and communication was excellent.
If you're thinking about booking Doug and Anna's place, I'd say book it now!