Renting in Dubai is unusually rule-bound, and the rules are public. The RERA index sets what a landlord may increase at renewal, notice periods are fixed, and a great deal of what tenants accept at renewal is simply not enforceable. Most of the leverage in that conversation comes from knowing which is which before it starts.
The other question worth answering early is whether you should be renting at all. For a tenant staying five years or more in the same community, another year of rent is often the more expensive option, and the break-even point moves with the mortgage rate and the service charge rather than with anything a landlord says.
These pieces cover renewal rights, deposit and notice rules, and the arithmetic of renting against owning the same unit.