@Paige7, Always remain polite, professional and don't fixate on reviews. Saying that you felt bullied do early on gets you both off to a bad start. Sometimes we need to find other ways to handle things for tha sake of remaining in control and professional.
@Paige7Once he was at the premises you are faced with a choice of letting him in or not, sorry for the awkward moments.
However, before it gets to that point there are measures such as declining with a concrete statement such as" I am sorry but there are other guests staying at the accommodation and they are having a late check-out. They will not exit until xx.pm. It will take 2 hours after this for the cleaning." You are welcome at any time after zz.pm. I will text you to confirm. access is available." This makes it clearer that the room will be in use and that there is no point in turning up early. Guests are inclined to imagine that the room is empty and ready if they can see a vacant day on the calendar. If you are not expecting a booking by the time you are in the 24 hour window prior to their arrival, then block the date online and this makes it clear the room is not available to other guest enquiries, including early arrivals.
You cannot stop them from showing up but you can control entry, and suggest they pop down the road for a cuppa while the trades are finishing up or the room is being made ready.
Early and late checkin/outs will be regular requests. You will need to decide in advance how you will handle them and stay firm and friendly and calm. You can also agree to these requests and set a small extra charge for the convenience and as a part payment for the extra time they are occupying the room.
Avoid thinking with terms such as bullied and manipulative, they won't assist your frame of mind or attitude to your guests. The guest's role will always be to ask for things. Your hosting role is to decide what you are offering, and look for positive, creative ways to manage your offerings and set clear boundaries. Sometimes it takes time to find your way to do this, without feeling bothered.
I hope these thoughts are helpful to you.
Regards, Christine.