My friends and I stayed at Justin's flat for four nights and honestly had an amazing time there.
The purpose of our trip was mainly to attend Edinburgh University postgrad open day, and we were delighted to find out that the university buildings were literally around the corner from Justin's place.
The flat itself was beautiful, so spacious and clean, and really close to both Old Town and New Town. Across the street there is a Tesco Metro and a Lidl, and a Sainsbury's is also just a little further away - and Justin's kitchen had everything we needed to cook, so we had no troubles whatsoever with meals.
That said, Justin was a great host! Usually the check in is after 5pm but he agreed to meet us early in the morning instead, and was generally super helpful with everything. He left us cakes and Irn-Bru, and made sure we knew our way to the University.
When we needed a hairdryer but couldn't find it, and he was at work, he gave us directions to the closer convenience store and then dropped by in the evening to refund us and he also bought us a bottle of wine!
We enjoyed our time in Edinburgh so much, the city itself is lovely, and would totally recommend Justin's place.