Is haggling of any kind appropriate when surveying a rental property?

My wife and I are going to preview a condo today that, if all goes well we could end up renting.

My gut instinct is to try to haggle and bargain for a few things: some money off on rent each month, a month or two preview before signing a lease etc.

Is this taboo? I’m completely new at this, can someone tell exactly what is and what is not appropriate?

ps, this is happening in Michigan, an area some people consider to be “Ground Zero” of the failing US economy. (If that has any impact)

Thanks!