Unfortunately I agree with this)) I have had cases when I was very nice to the contractor, we were almost friends, and then the person was so relaxed that he did his job undiligent. Recently, I had this situation with a cleaning company as well. I was already a regular customer and they eventually began to work worse( I will not tell their name. I'd rather advise the company I'm working with now - https://www.emop.co.uk/northolt-cleaner.