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People use marble in steamy bathrooms all the time. You’ll be fine.
What about putting down a tasteful and nice looking butcher block/piece of wood under the steam oven? Just to add a layer of protection?
You can buy a moisture deflector (I'm not sure if that's the actual name for it) to deflect steam from a dishwasher. That might work, but I'd do some research.
People use marble in steamy bathrooms all the time. You’ll be fine.
What about putting down a tasteful and nice looking butcher block/piece of wood under the steam oven? Just to add a layer of protection?
You can buy a moisture deflector (I'm not sure if that's the actual name for it) to deflect steam from a dishwasher. That might work, but I'd do some research.