Do you respond to positive reviews or only negative ones?

[Helen267]

I've just had my first review (5star) and wondered what the done thing is? On TripAdvisor I think it's great when the owners respond nicely to positive reviews, but I can't recall seeing it done on Airbnb - it may not even be possible?

[Judi71]

I'm new to the Airbnb game, so I find myself reading many responses to these types of questions: to respond or not to respond.  So, I take the high road and I am currently responding to both.  But like many, after a while I can see myself running out of things to say.  I've already thanked the guest in a private email that I send before check out.  I've learned to wait until the last minute before posting a review about a guest even if you have a positive review for them.  I tend to respond via email to negative comments about my property. 

What and when do you post if you know your guest is going to write a negative review?