We stayed in Charlotte's very nice apartment for three nights including a Friday and Saturday in June 2013. It had new carpets and a new bed and a very nice kitchen. The view of the castle from the kitchen window is wonderful! You are really close to the Grassmarket area where there are loads of places to eat (but not so close that you hear any noise from there). Two of the hop on - hop off tour buses stop there, so you don't need to go into the centre of town to catch them. There is a Sainsbury's local about 150 metres away for any food you want. Charlotte met us outside and showed us where everything was. It's fantastic value when you compare it to a hotel room, and you get your own living room - so much better watching TV from your sofa that sitting on the bed in a hotel!
The apartment is nice and warm, and it's very quiet at night, so no problem getting to sleep. Thoroughly recommended - we will definitely stay here again if we go back to Edinburgh!