"Make it nice" is a phrase from my ancestral homeland (fig. 1) that is typically shouted at children by their parents when they need to clean up a mess. I find it applies well to UX and digital design in general.
"Making it nice" means making it accessible, making the information architecture well thought out, and making the thing pleasant to interact with. Thinking through all the details and making sure the person who's using the thing is prioritized.
People have to deal with plenty of crappy interfaces in their day to day life. I try to make stuff that's...well....not crappy.