This is an amazing apartment. Will stay again whenever I am in Edinburgh and it's not booked! Nothing negative to say whatsoever. The apartment is fantastically located, easy to walk to all of the cultural/historical sights as well as many many many excellent restaurants. There is a coffee shop right across the street for delicious breakfasts, and a coop store right across the street for anything you might need.
The apartment is huge. We were 2 friends, but there are three bedrooms (all with double beds) and three bathrooms (2 of which are ensuite). Living room is enormous, kitchen and dining area also enormous. Every amenity you could think of.
Solid wifi throughout the apartment, and an integrated sound system if you want to play your music in different rooms of the house. Netflix and Amazon Prime on the TV.
Communication with the host was very efficient. I was able to check in a few hours early, which was a very nice gesture on the part of the host.