I live in a 48sqm apartment and never even thought about this. I work usually either from my little desk and kneeling chair in my bedroom or my couch. My remote coworkers at different levels have all kinds of stuff in their backgrounds - pets, kids, books, walls, posters, clutter, paintings, and thinking back I have not once found myself judging them negatively _or_ positively for it. A candidate judging your house in an interview seems super awkward - for the candidate. What a weird thing to comment on.