Me, my girlfriend and my parents have spent a long weekend in Edinburgh and we all agreed that the apartment is worth every penny, the location is superb, probably one of the best in town as you 1 min away from the Royal mile but you have peaceful neighbourhood to sleep! The footpath to Arthur's seat is only few minutes away, since the apartment is in the city centre you have plenty of options to eat and drink.
Apartment itself is as it should be, very clean, it has all the necessary utilities you need, there is enough space for 4 people. The only thing you might miss is the number of chairs at the dinning table (I believe there were 2 or 3), however, you can seat down on any of the sofas.
Jazz and Silvia were very helpful through the whole process, they were extremely friendly and flexible. Unfortunately we were not able to meet as they were out of town, but they arranged with their friend Mel who took care of us brilliantly :)
Bottom line - We would definitely come back again!