What was the name of Sherlock Holmes housekeeper?

Martha Louise Hudson (née Sissons) is the landlady of 221B and 221C Baker Street. She rents 221B out to Sherlock Holmes and Dr John Watson. Mrs Hudson lives in the same building in a flat of her own.

Sherlock won his way into her good graces after ensuring that her husband was executed for a double-murder in Florida. Due to his assistance, she allows Sherlock and John to have the flat at a lower cost than what it is worth. According to John, it is in a "prime location"