Location, location, location - there's really not much more to it! This place is literally in the heart of it all in old town Edinburgh, on the one block of the Royal Mile that is blocked off from car traffic so people can walk in the street! The castle, cathedrals, museums, shops, restaurants, pubs, whisky shops - all at your fingertips and within minutes just walking out of the door.
Four of us (all adults) stayed here comfortably during our time in Edinburgh - really used it as home base more than anything, as we were out the door in the morning to see the sights and usually not back in until the sun was down around 11 pm! Being so central it *does* stay pretty noisy at night, but we knew that ahead of time and just brought earplugs to help us sleep. Overall it's a great place to stay for exploring old town.