@Orla27 You can count me among the others who loved your response to that review. No, it wasn't "nice" but it was perfect (as far as I'm concerned "nice" is a highly overrated virtue). The responses that would put reasonable guests off booking are the ones that go on and on in an emotional, defensive, or aggressive manner, not the succinct, funny ones.
I have very flexible check-in times and late (4PM) check-out, as I leave myself a day between bookings. And if a guest had a late flight and wanted to check out at 6, I'd not have a problem with that, as long as they were polite about asking, not assuming or demanding. Same with check-in. My check-in window, 11 AM to 11 PM has worked for all my guests so far, except one who was arriving on the bus at 9AM. But when I asked for her arrival time, she said she realized that was too early to check in, so she'd amuse herself in town until 11. As she was so respectful, I told her a 9 AM check in, if she'd prefer that after a long bus trip, would be fine with me.