Adam's apartment is in a wonderful location, well served by buses and good food. Adam is a gracious and thoughtful host. Your stay in Edinburgh will be made more enjoyable as a result of staying with him.
The flat is pleasant and sunny and you are very close to some of the most beautiful parts of the city, including the Botanical Gardens and the Museum of Modern Art. The only possible negative thing I can find to say is that the flat is on a steep hill, so if walking up-hill is an issue, you may want to stay elsewhere. If that is the case, you should also know that the entire city of Edinburgh pretty much falls into the category of "built on a steep hill" so go to Norfolk!