@Olga464
I just had two instances of guests snooping in private areas. I live in the home and have 3 very clearly marked areas that say "PRIVATE, No Guest Access." The only door that has a key lock is my bedroom door. One set of guests attempted to open my bedroom door, they opened the office door (clearly marked private, remember!) and snooped around, then they also entered the third private area, my garage, and stored their things in there.
Another set of guests just a few weeks later snooped in the office.
I also have guests who use my kitchen dishes even though I clearly tell them there is a guest cabinet with things designated for their use. This doesn't bother me as much as people entering the private areas.
Since these two incidents, I am now locking the office door (it can still easily be opened with a pin) and I reversed the lock on the garage door so you need a key to enter the garage from inside the house. I'm hoping that ends the snooping.
@Huma0
To answer your camera question, yes, you can have cameras in private areas, but yes, they do need to be disclosed. That's how I knew my guests were snooping. A motion sensor triggers an alarm on my phone and records 30 seconds. I would never put cameras in common areas, but areas guests are not supposed to be in, fair game!!