I can't recommend this flat enough. Gorgeous interior, wonderful view of the castle, huge tables to work from, spacious and comfortable rooms. We felt totally at home here, so much so that we wanted to sleep in and chill out rather than see Edinburgh!
Other touches we loved:
A.) Cleanliness!
B.) Being able to make a real cup of coffee in the morning (not the nescafe crystals or coffee pods!)
C.) Ability to wash a load of laundry
D.) Provided shampoo, conditioner, and body wash
E.) Comfortable bed
F.) Food / breakfast left on the table
Nathan left a detailed and helpful note for us, and his sister Sarah showed us around the flat, both making us feel very welcome! Awesome people, and an awesome stay.