The first thing that comes to mind are the employees. Do they actually QUILT???They need to have the passion and experienceto help others (whether they are beginners or experienced) and friendliness goes without saying. They would help with choosing colors, suggesting a pattern that is YOUR level, and other tips.
Samples should be hung on the walls seeing the finished project
A well stocked notion wall with a section of "just in" new items
Shop should be organized and clean with no piles of supplies in the corners
A section dedicated with "gently used items" that ex-quilters have left for consignment including quilting magazines and books
Shop would offer long arm quilting services OR a list of locals that provide the service with examples of THEIR work.