"If there is no electricity, there is no water because the water pressure in Tehran is low and all buildings have electric water pumps. You can't cook either. In the north, you can at least do something in nature, like the 'Stone Age' that he promised," she said.
The designer spoke on condition of anonymity for her safety.
Normally a popular vacation spot, the Caspian Sea coast is carpeted in forested mountains with plentiful water - unlike other areas which have suffered years of drought.
US Vice President JD Vance says he's 'confident' Iran will respond to US demands by evening deadline.
"I hope they're smart," he said.