Nice place, 30 mins away to Edinburgh Castle.
Lots of places to eat nearby. The apartment is on 2nd floor overlooking a quiet street (somehow unexpected in the middle of the city); Street parking available for up to 4 hours (some cars were picked up for parking on double lane). Please be aware if you bring your own car.
Check in was easy. The flat itself is nice with everything you may need for a few days' stay.