(1) a statement of his demand, and the amount thereof, after deducting, as nearly as possible, all just credits and offsets;
(2) the name of the person by whom he was employed;
(3) a statement of the terms and conditions of the contract, if any, and if there is no express contract, a statement of what the service, work, or labor is reasonably worth; and
(4) a description of the property to be charged with the lien sufficient for identification with reasonable certainty.