Marion was a very easy host to deal with and answered all of my questions.
We traveled to Edinburgh by coach, which dropped us off at St Andrews Square which was a 10 minute walk to the appartment where Marion met us.
The appartment was ideal for our weekend visit for the Wales vs Scotland rugby match, with everything we needed. 6 of us slept cofortably in 5 single beds (2 of which can be made into doubles if I understood) and a sofa bed in the living room. Although the kitchen is small it had more than everything we needed, and the bathroom was very nice.
It's located just off the Royal Mile in a very quiet courtyard, and was about a 5/10 minute walk to the Grass Market area.