No improvement assessment shall be rendered invalid by reason of a failure of the city manager’s report to contain all of the information required by section 7.465 or by reason of a failure to have all of the information required to be in the improvement ordinance, the assessment ordinance, the lien docket or notices required to be published and mailed, nor by the failure to list the name of, or mail notice to, the record owner of real property as required by sections 7.465 to 7.565, or by reason of any other error, mistake, delay, omission, irregularity, or other act, jurisdictional or otherwise, in any of the proceedings or steps specified, unless it appears that the assessment is unfair or unjust in its effect upon the person complaining. The council shall have the power and authority to remedy and correct all matters by suitable action and proceedings.