LDG No blue,
Nothing special to tell you about this 450 figure, go to the housing dept. and ask what is the maximum rent you can go up to in your quest for the best appartment in Bah., in one of the buildings (in Juffair of course) whose landlords have some agreement with GF.
That is the figure you should be given. If not, then you should re-check your contract, because if married your housing allowance should be 350Bds per month which is the "bold" figure for a flat only, on top of that comes the municipality tax and utilities, plus, you will not have to disburse whatever advance payment, cause Gf is the guarantor, after what you'll have to stay at least 1 year in the abovementioned accomodation.
Hope this helps.
Cheers.