Windmills are already a universal symbol of dreams. More precisely of dreamers who, against all odds, manage to transform their reality into something else.
Your cafe has many literary references, and not only because you want to have books there: apart from the windmills ), which take me to Quixote, there are the cupcakes, which evoke Joyce's Ulysses, and invite to a trip down memory lane.
I know of no better substance for a dream than rootedness in memory.
And there will be music... which brings me to Cortázar....
I hope your dream comes true and I hope I can have my picture taken in your cafe.