If you only come for a weekend, location is everything. You are in the middle of everything, you can view the Xmas market from the studio windows and you are only 5-7 min walk from the train station. Absolutely superb location!
The only small comment is that the road passing by the building is fairly noisy and, if you are like me, not hearing a single car overnight when at home than you will struggle a bit with falling asleep.
If you're going to Edinburgh though for only a couple of nights, you will probably wonder around the streets up until late in the evening so you won't be that bothered with the noise when you come shattered after all the walking.
On this note, I will definitely stay here again!