We stayed for 3 days with 4 people. Armando let us into the flat in a timely manner after our arrival, walked us around the flat to show us everything, and told us about the history of the building as well. He was highly knowledgeable about the flat and seemed to really care that we had a great stay.
The location is really amazing, and they aren't kidding when they say it is right next to the castle. While it is a 4th story walkup, we didn't find it to be that bad because we only really had to trek it once or twice a day.
The accommodations were great for what we needed, with a nice living area space, The view of the castle from the living room is quite nice, even though the tatoo was still up during our stay, and its a 50 yard walk to get to the entrance of the courtyard of the castle from the door. The bedrooms were a decent size, and the kitchen even had a french press for coffee, which was a nice touch.
While the shower is small, that really isn't uncommon in these types of flats, and wasn't a bother. Water pressure was good. It was nice that the shower and the toilet were in separate rooms, which allowed us to get ready in the morning and wind down in the evening more easily.
When we get the chance to travel back to Edinburgh, this is the place we'll look to book.