UNITE is far better than OPAL 1,2 AND 3... If anyone is studying in town (Rose Bowl etc) I would advise staying in the plazza or sky plazza thats were i lived and its really nice and the town is on your doorstep which saves alot of money!
First year i lived in Concept place (opposite opal 1/2 and the tannery) which is also really nice.. but a 10/15 minute walk into town, my housemates lived in Opal and they said if they went back they would have picked unite.
Single beds suck in opal!