Are smart locks safe to use on an Airbnb or short-term rental?

Yes, and most reviewers consider per-guest access codes the killer feature for rentals. The Schlage Encode lineup is marketed as Airbnb-compatible and supports up to 100 codes with scheduling, while the Ultraloq U-Bolt Pro also handles ekey sharing and scheduled access. Look for lock-history logs and auto-lock, both of which the picks here include.