Your country crafts are not likely to sell well in a shop that seems to specialize in sixties memorabilia. Check out your likely competition. You could benefit from this kind of competition. This is a security problem waiting to happen. You may find that you will be competing with the people who are responsible for steering customers to your booth, which is not a good thing.
Life is too short to be aggravated by personality conflicts.
Collect business cards and names of other vendors. Some shops discourage this, as they are afraid that vendors will avoid sales commission by selling directly to potential customers. If necessary, hang out in the shop until you have a chance to see and speak to other booth renters. They can tell you if they are happy with their arrangements. Find out how the shop keeps handles sales inventory records.