to be Carrie Bradshaw for a day, now’s your chance.For just $23 a night, Airbnb is offering guests a chance to stay at a re-creation of the iconic “Sex and the City” character’s brownstone apartment — walk-in closet included.While Sarah Jessica Parker’s Bradshaw notoriously lived on a writer’s salary in a spacious Upper East Side one-bedroom — that would cost at least $3,000 a month today — this nostalgic sojourn will instead be in the tony Chelsea neighborhood for the cost of a Cosmopolitan.The