In January apartment was warm, noise isn't a problem building and area is quite. Apartment was a pleasure to cook in, Washer/Dryer worked well. Anything you need from Groceries, Pharmacy to Post Office, Transport is all easy walking distance.
Location is perfect for exploring Edinburgh on foot, lots of attractions and museums to see. Lot's of great pubs and food place's nearby.
As for the cons the many stairs(be fit and sober) and slow 2Mbps internet speed both of which are common issues in old city.
I stayed for 2 weeks, would happily stay again.