Sydney is amazing. I lived there for a year, after my now dh and I had been together for almost 6 months and his visa ran out. The only viable option if we wanted to give it a go was for me to go there. I've always been a wimp about being away from family and friends, but did it, and it was incredible. Yes, I missed them, but wow, what an experience. It's an absolutely fantastic city.....
The climate. Darling Harbour and all the amazing bars and cafes, the walk around to Circular Quay, more amazing restaurants, the sheer sights of the Harbour Bridge and the Opera House, all the ferries, the skyline of the City and North Sydney. The train trips across the City, especially across the bridge. The views from Mosman, yummy fish and chips at Doyles, shopping in David Jones, the amazing Superdrug-type store I can't remember the name of, the food courts....
The fab Westfield shopping malls, the sheer number of outdoor play areas, Balmain Market, Drummoyne outlet centre, DFO outlet centre, Leichhardt Italian forum, all the rugby, the great supermakets with so many different things, the Anzac Bridge, Taronga Zoo....the climate!
Blimey, someone stop me! It's amazing. I did get homesick and teary and wonder why I was there sometimes, but it was a wonderful lifestyle. I've always been such a London fan but it was a real eye-opener.
Best of luck - a year really isn't that long, you'll have a blast!!