There is no perfect guide to building a good café, but a lot depends on personal taste. What I can say is that you can do your best with what you have available. Of course, with more items and possibilities, the café can have a layout just like you dream of. My advice is to customize the café by choosing the style you want to achieve. For me, I start by picking colors that represent me. I prefer neutral colors in the background with colorful elements that bring in the green of nature, creating a calm and relaxing atmosphere. As for the furniture, I go for tables and chairs that fit this style, even if they are a little imperfect compared to the original style.
When it comes to arranging the tables, I always struggle a bit. I have a very schematic mind, and filling empty spaces often makes everything seem a bit chaotic. So, I try to leave plenty of space between the tables to give the impression that there’s freedom of movement. There might be fewer customers, but my eyes relax in spacious surroundings :D
When serving customers, organization is everything. Three orders at a time makes things go faster. And to unlock more things to add to the café, just keep progressing with the main story!