I occasionally post reviews on TA. I would be OK with getting an email from the manager along the lines of "....so sorry to hear that you didn't enjoy your stay, what can we do to make it right....".

If a review contains gross errors of fact (not matters of opinion, subject to fair comment) that are damaging business, then legal action may be a reasonable last resort - though this does not seem to be the case in this instance. Free speech does not extend to making intentionally defamatory claims - any more than it extends to a business knowingly making objectively false claims about it's product.