There was mold in my apartment before I moved in, is my landlord liable?

I'm currently residing in California and I recently signed a lease to move in a new apartment on June 18th. Upon entering my new residence, there was an overwhelming mold smell from a poor vent/fan job done by the carpeting cleaning crew. I immediately emailed my landlord to request to have the carpets re-cleaned. She finally scheduled the carpet re-cleaning for June 22nd, That is 4 days of a mold infested apartment. To ensure the safety of my fiance and myself, we stayed with a friend until the carpets were properly cleaned. Is my landlord liable for this, and should I demand to have my rent for those 4 days reimbursed? Thanks!