The council shall make all necessary rules, regulations and appointments to office as herein required. The council may set a probationary period for any person hired by it. All employees and subordinate officers shall attend council meetings as they may be required by the council; they shall keep the council fully informed as to the operation and needs of their various departments, and shall perform all other duties required by this charter. Employees appointed by the council shall be removed by it only after giving such appointee a reasonable hearing.