I think @Gene8 means leave a response to the review the guest left for you as a host. That is a nice way of letting your guest know how the experience was for you, but keep in mind that also for a guest reviews on their profile are important, too. They help them secure bookings. Also, you get to leave a private message to your guests if you go through the normal review procedure. There are plenty of reminders for leaving your review, now you know about the time limit you can make it work in the future.
Enjoy hosting!
Babs