Location, price, and size are tough to beat. This place is literally 60 steps to the nearest grocery store, and seconds to great bars, restaraunts, etc. Old town is a short walk and so is Arthur's Seat.
Kitchen and utensils are more than adequate. The only heads up I can give is the bed in the bedroom is small. So get cozy if you're with a loved one. But the pull out couch has more than enough room. The water pressure is low in the shower.
All in all this place is a very bet for staying in Edinburgh and Robin has excellent communication. No complaints with anything.