We had a very nice stay in this apartment during 3 days. It is well situated, in a very calm place, as no passing road surrounds the building.
Flat is very clean and well furbished, with very modern equipment.
To go to Edimburgh castle is really easy and takes only 10 minutes walk. It is anyway preferable not to have a car, as parking is a little bit complex in city center.
Denise provided us with all needed information in advance and was waiting for us when we arrived, she explained everything that was needed and would have been available in case of problem, as she lives close to the flat.
In a nutshell, we had a very experience in that place, we recommend it without restriction.