Everything about the appartment was absolutely perfect. Is 2 min walk to the Haymarket stations when you can take any bus to the city center and arrive in 10 minutes. But you can also walk to the city center, it would take about 20 minutes. If you arrive at the Edimbourgh Airport, a taxi to the appartment will cost about 18-20 pounds, so if you are 4 people or more it's cheaper than the bus.
The appartment, is really clean and tidy, cosy and well equipated. The heat works really good and fast so don't worry about the cold weather outside. The neighborhood is quiet and there ase some supermarkets and restaurants.
I strongly recomend Josua and his appartment!