Month one has a pattern. Almost every new host we've talked to hits some version of the same three problems, usually in the same order.
First is the double-booking scare: you're managing availability across two calendars by hand, someone books the same date twice, and you find out when the second guest arrives. It isn't a rare edge case — it's the default outcome of manual calendar management running long enough, and the fix isn't being more careful. It's not relying on manual sync at all.
Second, usually a week or two later, is the housekeeping handoff that didn't happen. A guest checks out, the next guest checks in the same day, and somewhere in between nobody told the cleaner. This is almost always a communication gap rather than a scheduling one — the booking was known well in advance, but whoever needed to act on it wasn't looped in with enough lead time.
By the time the third one shows up, it's usually at checkout: a guest asks what a charge on their bill actually was, and you're scrolling through WhatsApp and a notebook trying to reconstruct it. Guests don't mind extra charges. They mind not being able to see where they came from — which means the fix isn't a better memory, it's an itemized folio from booking one, built before the first awkward conversation rather than after it.