When you are looking a studio, it is important that you have some idea of what you want to get out of your dance training. Then contact studios in your area to find which one offers the training that suits you best. If possible ask about trial lessons (or buy one) or about attending weekly dance parties to meet with other students. The latter is particularly important for social aspects of a studio experience.
If you happen to like the staff at a particular studio and how they treat you, you will likely be happy with the studio.
Blair