@Jennifer1775 Instant book does help with listing search placement. If you keep instant book on for the duplex, set the requirement of 'recommendations from other hosts', and good reviews only. Just don't trust in this completely, as it's not always fail safe. Locals with new profiles, no reviews, skimpy profile details/old profiles with no reviews are risky. You or the owner or a caretaker of some sort really needs to live nearby to be onsite in short order if need be.
Install cameras (disclose prominently in listing, to cover your butt and to discourage would-be partiers) that can be monitored in real time so if a party does happen, someone can be there to evict and shut it down the minute one extra unregistered person steps through the door. Specify up front in the listing description and rules that extra unauthorized people on the property are cause for immediate termination of stay. Best to have someone there for check-in...require ID to be shown...note this requirement in your rules/description, with a view to discouraging these who want to get up to no good.
You could also put in your description that local people MUST send a request to book only...no instant booking. May get ignored or overlooked, but it could help.
If you get a local booking, you'll have their full name and ph#, so look them up online and see if any red flags come up. Ask them direct questions about what their plans are and remind of the rules, re extra people etc. You have a bit of leeway to cancel an IB reservation, especially if it's waving red flags.
Instant book for a place like the duplex takes some extra care and attention, but once you get the right protocol and protections in place, could be doable. Proceed with caution.