We stayed at Steven's place for three nights during festival season in August. Steven is a perfect host, easy to communicate with, and always available for help and tips. The apartment is extremely well located (a bus stop with multiple lines around the corner – you don't hear the traffic though), and the meadows with much of the urban action in walking distance.
The apartment is spacious, the kitchen well equipped, the bed comfy. We also used the sofa as a bed, which worked perfectly fine.
All in all, Steven's place is a perfect base for exploring Edinburgh. Go for it!