Be up front about your expectations. If she/he has 2 hours what do you expect them to finish? Do you want the oven and fridge done on a rotation basis? Do they even know how to clean. Hand them a furniture spray cleaner and a rag and ask them to do the coffee table. I saw one who sprayed her rag rather than the table, which put polish on the rug, which in turn traps dust and dirt until you have a dirty spot
I've also had things stolen by a family member...
and I misplace things all the time, today I've turned the kitchen upside down looking for my pink pyrex bowl. If I had a cleaner would I reach the conclusion they stole it or broke it and hid the evidence? Or have I broken or misplaced it and don't remember?