First it was hard for me to take off my shoes every time I entered a Japanese house or private space. Now I’ve become so used to it that when I’m back in Spain I tend to take off my shoes even in the cases I’m not supposed to.
My subconscious tells me that it is not good to walk into a house with my dirty shoes. Even if the shoes are not really dirty, the fact that the shoes have been “outside” makes them “dirty”, or “not-pure” enough to touch the floor of an interior place.
I’ve found that living on the floor has its advantages. I love that it makes even tiny houses look wider when you are inside. By forcing you to be on the floor you tend to have less furniture. If I really need furniture I try to buy “low” ones (low chairs, low tables etc), so I have good access to them even when I’m sitting on the floor. It also makes everything look like much less cluttered than when we fill our rooms with “high” bookshelfs/beds/kitchen-tables like we do in western houses.
Take off your shoes, sit on the floor next to a window filled with sunlight, read a book while drinking a tea.