I have stayed at the Sydney Beachhouse YHA on many trips to Sydney over the last 10 years, and have to say it is the most friendly and warm nice place to stay. I have made good friends there as people of all ages and nationalities are there. Not just youngsters. Indeed I have a friend from UK who goes every winter like I did for many years, to avoid the cold weather here and she books the same dorm year in year out. It must be good.