Anna and Ian were amazing hosts (even without have seen them).
I booked that flat for my dad, his wife and couple of friends : they were extremely satisfied. The place is beautiful, the flat is well-located, Anna and Ian are very accommodating and allow them to let their stuff earlier at the arrival to let them start enjoying their travel. They were very available and were answering quickly to each of my/their requests. They also provide a lot of good places to eat, to drink, to visit.
According to my dad (i wasn't there but all i'm writing is what he felt), this stay was very satisfying and he will with no doubt advise this place to friends if they want to stay couple of days in Edinburgh.