I visited Edinburgh with a friend during the Christmas holidays and we stayed at Susan's house. The house is in a quiet neighborhood, easily reachable by bus at any time -Edinburgh has a very good public transport system. You can easily get to the city centre or even to specific sites such as the Rosslyn Chapel.
The house is lovely, very clean and provided with all the essentials. There are a couple of supermarkets nearby for any need.
Susan is a very good host - communication with her was easy and immediate; she's proactive and ready to help her guests in case of need. Also, check-in and check out were smooth.
We really felt welcomed and at ease during our stay - we would highly recommend Susan and her house to anyone wishing to visit Edinburgh