The accommodation you get is the accommodation you keep. Some is very good and some is very good but all of it is a lottery. Single F/Os get a 2 bedroom apartment, married F/Os with no children get a 3 bedroom apartment, everybody else gets a villa.
Silicon Oasis is indeed full so they will put you wherever they have space (that lottery again) and you may spend several months in "temporary accommodation" which almost universally isn't very good.
Alternatively, you can take the "utilities allowance" which comes out at about 120,000 Dhs a year for an F/O and that will rent you a nice one bedroom apartment or a very average two bed but at least you have some kind of control over where you live and in Dubai that can make a very big difference to how happy you and your family are.
Sorry if that is all a bit vague but hey, welcome to Dubai.
