I'm late but my 2 cents ... (also worked & taught in 2 LQS a few yrs back) -
As a CUSTOMER I want to see:
Good lighting !!
Inspiring displays with Patterns AVAILABLE
Variety of fabrics ... and more than just 3 fabrics from a line !!
CURRENT books & patterns
A comfy place to SIT and browse new books
Enough classroom space
** MOST IMPORTANT OF ALL - FRIENDLY & HELPFUL STAFF !!
You can have ALL the fabric & books in the world, but if your staff is less than friendly & helpful, a shop won't make it !!