Maintain the 'clutter'
Most people think zen is about absolute minimalism but that can be hard for most people, especially when you're living in a small space. For starters, embrace the space you have. Marie Kondo got it right when it comes to surrounding yourself with things that spark joy – keep the things that don't out of sight!
Invest in smart storage, or if you wish, good-looking storage. Hide those unsightly cables and wires, put (and hide) away tacky souvenirs that were given to you and keep the stray shoe, sweater, makeup brushes, art supplies or whatever you might have laying around efficiently in a box. Of course, IKEA would have plenty of options for affordable storage but you could always keep it cute with LEGO boxes perhaps?