It's all the rage now, but my wife was on Square Foot Gardening almost forty years ago when it was new and hot. We were very much into trying to be back-to-the-land then, putting in a vegetable garden in what turned out to be the trash bin of the first owners, complete with old bottles of patent medicines. We had had wonderful years of our own sweet corn, cutting our own firewood and Christmas trees from our tiny forest, and a variety of vegetables for canning.
Yeah, that's a lot of work when you are both working full time, taking in foster children, have reading addictions, and are volunteering at the church, y'know? Especially as neither of us were emotionally gratified by physical labor, as some folks are. That granola phase gradually went away, but Tracy hung on with that Square Foot idea for a long time. We gave up on the corn and eventually the strawberries, but the tomatoes and sugar snap peas lasted into the 2000's. Then one day, long before Marie Kondo got rich off the idea, my wife decided that vegetables didn't bring her joy anywhere near as much as flowers did, and it's been decorative plants here ever since. Green beans are cheap, after all. Why pay yourself $.23/hr to grow them, unless you like the various parts of ordering, planting, watering, weeding, harvesting, and canning for their own sakes?
We can give it the recommendation that the basic idea works even if you are in a triple decker apartment.