Organization is key to small living. Everything has a home and if you keep up on it you will find your day to day life less chaotic in the scheme of finding things.
Under my sink cabinet I keep three small baskets.
One for cleaning products, one for cleaning utensils, and one for misc items like trash bags and twist ties.
This makes reaching for things a breeze and I never have to search for a cleaning item. Even when living in small spaces you would be surprised at how you can easily misplace things.
I also love the idea of putting a curtain rod under neath your sing to store paper towels conveniently, although I haven't taken this step myself yet