Do I need to tell anything to the Pro when he comes to my house?

It is better to tell him about some nuances in the apartment, about complex spots or stains where you would like to see the greatest effect after cleaning. What hidden dangers are there at home (it is better not to turn the faucet to the position of hot water, because it has already broken in this position) and which statuette he should be careful with, since it is a family heirloom that is passed down from generation to generation.