I stayed at Valentina's place for two nights. It is about three minute's walk from Haymarket Station, and about 10 minutes walk to the very centre of the city. This makes it an absolutely fantastic base for a visit to Edinburgh. Valentina was very helpful and communicative prior to my visit, and was very friendly when I checked in.
The flat was very clean and tidy, and the bedroom and bathroom were spotless. Because the flat is to the rear of the building, overlooking the communal garden, it is very quiet, with no traffic noise at all. The price was very reasonable. Highly recommended!