Cautionary tale: Last year my neighbours (their rental is next to ours - not on Air) installed a lock that required a phone app. The owners don’t live nearby so it was a great check in solution for them.
The problem is that every single guest since then has had a problem getting into the rental. This isn’t the fault of the app - more a case of guests arriving who don’t have iPhones (or equivalent) or who arrive with no power in their phones. Or it’s simply too tricky for the technically-challenged. Even those with the app and a charged phone seem to have a hard time with it.
The old saying - you never get a second chance to make a first impression.
One of their guests who was staying for two weeks told me every day that yes, she was enjoying her stay, but the fact that they had to wait for an hour to get in still rankled and annoyed her.
So yes, these can be a great solution but there are downsides. Just the other side of the coin