I thoroughly enjoyed my stay at 6 Hopetoun Street. As the pictures show, it is a modern apartment which I'm sure you will enjoy.
We did not use local buses, so I can't advise about that, but there is off-street parking available for those of you with cars, which is a bonus (just be sure to get the parking permit from the apartment to display on your vehicle). We also used local taxis to get to the town center (Central Taxis) which were very reliable.
I would definitely stay here again if I come to Edinburgh, and so recommend it to others.