In the past few years, we have covered plenty of stylish smart door locks. The U-Bolt Pro is also worth a look. It gives you 6 ways to unlock with or without your smartphone (app, fingerprint, password, proximity, key, and shake). You will be able to give your guests temporary access.
With the Ultraloq Bridge, you will be able to fully integrate this with your smart home and get it working with IFTTT and other IoT services. The companion app will allow you to manage users, keep a log of all activities, and do a whole lot more. It will be available for iOS/Android devices.[where to get it]