Really enjoyed our stay here, very homely apartment, modern and clean. As Mario mentions, the building itself is traditional and when you first enter the building hallway it doesn't hint at how lovely the apartment is. No noise from neighbours slept well. If you don't mind a little traffic noise as it's a fairly busy road but that's a positive as bus stop literally just opposite!
Great cafe up the road too call Red Kite really recommend. We headed here before walking up Arthur's Seat which is very nearby. Well located.
Mario's welcome backs he sends you are really helpful esp, I imagine, if you've never been the Edinburgh before.