My job asked me to move to Florida for 6 months. How do I deduct the rent I paid in FL for my temporary housing? (I was given a housing allowance, and had 2 apartments)

I live in Washington and paid rent for my Washington apartment and Florida apartment. It appears that the housing allowance is considered taxable income. So I assume I should be able to deduct my expenses. How do I do that? Aside from Rent and Utilities, what other expenses would be able to be deducted? (Furniture, cleaning supplies, etc?)