We had a great stay, the apartment is large, clean, and very well stocked, especially the kitchen which had everything we needed for cooking and more. It's situated down a fairly steep hill from the city centre, so expect a 20 minute or so uphill walk to get in. However there are nice restaurants nearby, so going into the centre isn't necessary all the time, shops are nearby also.
I'd highly recommend this apartment for visiting edinburgh, it's well situated and a nice place to be.