Me again lol, anyhow, are you gonna grow midgets, plants or trees? That is where to base the size of your room. You could do 12 plants in a cupboard, closet or entire bedroom. Yes an apartment could work, but remember that with over 100,000 people on our registry, inspections of rentals is becoming common place. I would recommend getting a wardrobe or something that you can lock and is not their property, then you can refuse for them to search it. Remember though, spill enough water it gets into the apartment below, you get an immediate visit from maintenance or management. I would look into a house, townhouse or very small apartment complex where there is not management or maintenance on site. Just my .02.