Edinburgh is expensive, and this apartment is probably in line with what you should expect.
The staircase could be and should be cleaner. There is nothing chic about the apartment but no reason to complain either.
The company managing the apartment was pretty responsive, but something should be done about the box at the front door where the keys are kept, as it is very difficult to open.
A good point: the kitchen was fairly well stocked with olive oil, spices, etc.