You can respond publicly or privately to Hipcampers' reviews. If a Hipcamper leaves a review after their stay, you will receive an email with their review and the options to respond.
Toward the bottom of the email, you will be given the option to respond publicly or privately via direct message (photo below of an example email).
If you click "leave a public response," it will bring you to the review directly on your listing where you can respond to the Hipcamper's review. A text box, like the one shown below, should appear to allow you to respond publicly or via message to the Hipcamper.