My mum, my sister and I stayed at Kaddeer's place for three nights and it was really lovely! The place looks very simple, but has everything you need and it's perfectly located with a great view of the castle, just around the corner from Grassmarket and the Royal Mile. Self check-in was simpler than expected and Kaddeer was very helpful with instructions for it. I would recommend it for couples, but it was fine for us three!