Stop. Don't look at any other apartments or homes for your stay in Edinburgh. This is the place you want to be settling into at the end of your day visiting this awesome city.
We just finished a four night stay here and I write this as we are headed back to London on the train. Derek was great with communication throughout, was at his beautifully modern apartment residing in a building built in 1807 and guided us through the apartment, explaining the ins and outs of our stay and offered up details about the city as we have never visited here. This apartment is quiet, comfortable, with easy walking access to the city and pubs right down the street.
All the other reviews are spot on. You will love your visit to Edinburgh if you stay in Derek's place.
Cheers!