@Alice-and-Jeff0,
I only had it one time that someone broke the house rules: sneaking someone else into the apartment for an overnight stay, it was their daughter, but I had specifically said no when they had casually told me (not asked me....) that she would be joining them. I had made it clear to them that our max occupancy is two, and that we are sorry, yet they got her in anyways for 2 of the 4 nights.
Once we noticed, I focused on: are they damaging anything, will this cause us any grief or inconvenience? Can I just deal with the disrespect without getting my ego involved? what is best for US in this situation? That is always the bottom line.
Having the daughter there didn't cause any damages, no extra noise, etc... , so to save ourselves some nastiness or a confrontation, I just let it go - but if it had been something worse or much more inconvenient, like repeatedly changing check in times, like happened to you, I would speak up immediately and be very clear about our bottom line: we all have our boundaries and once I would feel too much pushed around, or too many repeated violations, I would put that person out. A lot of hosts worry constantly about their 5 star ratings, as if they are powerless because of that - I am not intimidated by that, and wish other hosts wouldn't be either.
These guests also didn't communicate with us during their stay and left without saying good bye, not writing a review either. Now that I am more experienced with being a host, I would definitely step up and write a review on them calmy mentioning breaking the house rules. I am flabbergasted that most hosts who complain about guests in the community forum then turn around and actually write them a very nice review! Makes no sense to me. These guests I am talking about requested another stay with us 2 weeks later, and I declined, just citing to Airbnb that I am not comfortable with them. End of story, no drama, no upheaval.
I agree that prevention is the best course of action: that means to me to always being physically present when they check in: those 10 minutes of interaction give me an excellent feel for what is going to happen. I believe house rules are most effective if they are very clear and short, not a long list with gentle reminders or polite "please". It goes right over peoples' heads.
Guests are not our friends, it's a business transaction that is taking place - great if it is all very friendly but being "too friendly" about the rules sets one up for disrespect. I believe. Tightening house rules, such as check in time maybe just for 4 hours instead of from 2 pm to midnight, might be beneficial and preempt trouble.
Other preventive measures we have taken :
1.) No "el cheapo" pricing , yet offering excellent value in our opinion,
2.) no more than two guests,
3.) stays no longer than 4 days, which helps if the guest is someone we don't particularly care for.
Overall we have been very veruy lucky so far, no drama, no problems beyond a wine glass broken, some weird smells occasionally, a bit of a mess in the kitchen - but nothing outrageous ever!
Ps : I enjoy your posts and insights in the community forum, thanx!