@Mike-And-Myonee0,
Hello guys,
Most of my guests are first timers. And of course, on my first reply I always make sure they have read my house rules and ask them to properly fill in their profile in case they havent.
I have to say they all have been respectful and considerate during the whole process from making the enquiries to the day they have left my home.
Sometimes I find multi booking guests are more vicious because they have learnt how to cheat the system such as booking for one when there are more guests staying (knowing nobody will be there to check them in), abusing the house services (keeping the heating up when it isnt necessary) or threatening with leaving a bad review (because they know how important it is for the host).
Like @Sandra126 have said, engage in a conversation to evaluate their reaction first.