If you are engaged in disturbing activity in your house when the visitors came, then make yourself quickly and give some comforts to them. Moreover, provide them welcome drink and food by creating a relax mood in their presence.
i used to date a girl that was really messy. if she had an unexpected guest that didn't know she was messy, she would jokingly give them heck for dropping by when she was in the middle of spring cleaning. the irony was it wasn't spring when i dated her.