Hey,
I live at Gumal, and have been there for 18 months now. It is extremely convenient. 15 min walk to the heart of Sydney city. 2 mins to a shopping complex where there are supermarkets etc. 2-5 mins to UTS city campus.
All the apartments have balconies. There is only airconditioning on one side of the building, because the other side does not recieve direct sunlight so there isn't a big need for it. I think that the 1 and 2 bed apartments are on the side where there is no air con.
There are studio apartments (1 bed), 2 bed, 3 bed, 4 bed, 8 bed and 9 bed apartments I think. I live in a 4 bed apartment. In your bedroom you get a bed with a mattress, a desk, a wardrobe with mirror, a bookshelf and a filing cabinet. You have to supply your own bed linen. Then in each apartment there is a kitchen (gas stove top, microwave... no oven. There is an oven available on the common room on the roof) with a small lounge room with a sofa and a dining table. You have to supply your own cookware. Also, there are two bathrooms in each apartment... one with a basin and toilet, one with a basin and shower. In the eight and nine bed apartments there are six bathrooms, with three of each type, and an extra big kitchen and lounge room.
Up on the roof there is a big common room with a big kitchen that you can also use, a large tv with cable television and several sofas. There is also a large outdoor roof area where you can have barbeques, eat, hang out and study. There is also another tv and sofas downstairs in the lobby.
It is a pretty good place to live, very very convenient close to the best bits of Sydney. There isn't a huge social life but there are a few planned residential events and orientation events at the start of semester. There are people from all over the world, lots of different ages, and studying lots of different degrees.
Put Gumal as your first preference, then Bulga (which is around the corner from Gumal and has 5 bed apartments.... but it is a lot older, Gumal is quite new) as your second because Geegal is a lot further from uni and the supermarket, and Blackfriars is really crappy. You will probably get a place in Gumal anyway because it is quite a large building.