Assuming this hurdle is overcome, explain exactly what you believe the review should encompass. If you want a value-oriented review, make it clear. Individuals that perform reviews usually do it because they care about the profession. To be sure that the would-be reviewer cares about the profession, you need to ask more questions. All in all, you will be more satisfied with a review done by a person who is interested in improving the profession.
Experience is repeatedly the best teacher.
You will want someone who is not only skilled in accounting and auditing matters, but also someone who has tried in numerous ways to improve his or her firm's efficiency. A reviewer who has tried many ways to improve efficiency has probably found a few that work. Good communication skills are also necessary. Unfortunately, there is often no correlation between experience and the ability to communicate that experience. Rapport between the reviewer and the firm may be the most important attribute.