We were a group of my wife and I plus our son and daughter and their spouses and our 18 month old granddaughter. The apartment was superb for us. There were two more beds and it would have been easily big enough if there had been eight of us. It is a really nice place in a beautiful area of Edinburgh that has its own charm as well as being close to everything central Edinburgh has to offer. The apartment hosts are extremely helpful and really helped our stay.
One caveat but this is about central Edinburgh not the apartment. We usually visit Edinburgh by train but we needed a car this time. During the week there is no permanent on street parking so you need to plan where you are going to park and how much it will cost you (we simply used a central NCP car park and moved the car to the street after 5.30 on the Friday (we were leaving before charging restarted at 9 on the Monday).