Carol's place is a fantastic place to stay when visiting Edinburgh.
First, "great location" is very precise and maybe even an understatement. It's literally next to the bus stop from which you can take a bus to the airport or from the city center to Carol's place. The bus comes every 10 minutes! Very convenient! It's 10 minutes from the airport (but free from airplane noise) and 15 minutes from the city center.
Carol is very friendly. She made tea for me when I just arrived, and we had some nice chatting. The room is clean and spacious and the bathroom is clean and well decorated. She is also very helpful when I was struggling with my flight checkin.