We stayed here for a few days in the middle of September. The apartment's location is great. Its right on the royal mile and is very easy to walk all the main attractions. We were three people, and it was a good-sized apartment for the three folks. The beds were comfy (even the sofabed) and the kitchen came in handy when the restaurants closed for the Queen's funeral.
It was chilly when we went to the apartment as the heater was turned off. The owners thoughtfully provided some space heaters, but they took almost a day to warm up the house. The water flow from the shower is also low and this surprised us. However, these did not get in the way of us having a good time in Edinburgh and the location more than made up for these drawbacks.