Great apartment in an excellent location. Be aware that luggage can be difficult to get up and down the spiral staircase. If you’re in good shape you’ll be fine. The higher room is wonderful once you make the trek up. Lots of dining and attractions nearby. You have a direct view of Edinburgh castle and the steps to enter are literally against the building.
Helpful things for your stay: Bring you’re own soap etc. You’ll likely receive toilet paper but you’re on your own if you run out. There is a washer but no dryer so if you’re from the US you’ll need to get used to a drying rack!
It was a great experience and a lovely place. I highly recommend it.