The flat is, spacious, clean and well decorated. The location is also absolutely amazing. It's in a very quiet street off Grassmarket, but you're right in the middle of everything in a just couple of minutes! I'd definitely recommend it and would stay there again any time.
We didn't get to meet Susan and Amit, but communication was pleasant and easy. They were also really accommodating, as we booked very last minute, less than 24 hours before our stay.