We stayed at Maureen's during our visit of the Fringe festival. We couldn't have found a better place. The apartment is beautiful and has everything you need. (The bed is heaven!) While you're located in the middle of the action at the Grassmarket, the apartment goes out to the back, providing not only great views to the castle but really quiet nights.
Maureen always replied to emails straight away and was super helpful. Wonderful host, wonderful place! Would go back any time!