In a job interview, in my opinion,the quality that most impress an interviewer are:
first apparence because if you have a good look, a good smile, a great power, an aesthetic care, the interviewer will like you more and him will appreciate you more and him will be very curious to know with whom he is speaking;
second self-control, decision, firmness which are the qualities that a manager looks for in his staff who must manage the problems of the company;
and the latest work experience and qualifications because without it a worker cannot improve the organization's skills