@Sofia34 You sound like you have the New Host Jitters. While no one, including Airbnb, can give you a 100% guarantee that the guests are trustworthy, it is very rare that a guest causes problems, despite what you read in these Community Center posts. Consider that Airbnb hosts accomodate millions of stays each year world wide with no incidents.
You, as a host, need to screen guests so that you are comfortable with them in your home. When someone makes a reservation inquiry or a reservation request, it is helpful to ask them what their plans are, what brings them to your area. Their reply will help you understand what they will be doing while at your place and give you peace of mind.
One thing you can do, if you haven't already, is to require Verified ID for anyone requesting to book your place. Go to Manage Listing and to the left of the Calendar and More box, you will see Reservation Requirements. Select the Verified ID option.
If this guest will be arriving and / or staying in your home while you are at work, I would encourage you to lock up any valuables and any rooms the guest is not allowed to enter. An ounce of prevention is worth a pound of cure. Be sure you have a check list of house rules that you go over with the guest when you first meet them. Are they allowed to use your kitchen? Refridgerator? Food?
You'll need to think these things through.
I remember my first guests and wow, I learned a lot from them especially seeing my place through their eyes.
I wish you the best of luck and if you have more questions, fire away!