Reading reviews when making a decision about which service provider to use is pretty commonplace - they helps us to understand a business from a client perspective, which is exactly what we need to know. But, like everything, with the good comes the bad. You're never going to be 100% perfect all of the time, and negative reviews will happen. But you shouldn't hide away from them. Instead, you should encourage more of your clients to review you. Just ask. Send a link to your Facebook or Google+ page and just ask. 

Most likely they'll be happy to share their experience. Not only will they feel valued for you asking, but  you'll most likely get a positive review from it.

 And if you get a negative review? Don't rush to delete, instead, prove how great your customer service is by responding quickly to the review publicly. Because we all make mistakes, but not all of us own up to them. When we admit fault, we show that we are human, thus helping to rebuild trust.