I wouldn't begin to guess about the size. Only because I would not want you to get your hopes up!
I will say this, they are designed to be fully furnished. And I mean linens kitchen and all. This does not mean you will like the quality of linens and kitchen equipment, but it is functional.
Best bet, when you come for the interview/sim eval, spend an extra day, go to Ain Khalid Gate and look for yourself.
Good Luck!!
