The apartment is indeed in a great location, right on the ridge between Old Town and New Town. The door leading to the street is bordered on one side by the Whiski Room and on the other by Makars Gourmet Mash Bar, both restaurants that we enjoyed. The train station is a few minutes walk away, and the Royal Mile just up a staircase behind the apartment.
The apartment itself has large windows facing north (?) allowing sweeping views of classic neighboring buildings which glow in the sunset, and a small park below. Very nice amenities, comfy beds, good water pressure, and best of all, engaged and attentive hosts. Highly recommend.