If you are looking for a weekend stay, or a week long stay, in or near Harrisonburg there seem to be LOTS of options on AirBNB. The search above, showing 93 options, was with flexible dates in August / September / October.
If you are considering purchasing a property to use as an AirBNB, keep in mind that there seem to be plenty of current options for those looking to book a short term stay.
Driving a bit further east, there seem to be right around 300 available options at or near Massanutten Resort.
What a difference from just a few years ago when short term rentals were just starting to pop up in this area!