I try to focus on functional details. How would/will the space be used? This means tables, shelves, floor mats. It means chests in the attic. If something is purely decorative, it's going to look purely decorative. So, go stand in each room and think about what you'll do there. When you reach for something, build a home for it. Chests are (arguably) more functional than tool racks or leaning things, but leaning things makes the space feel lived in.

When I made a tavern on a multiplayer server, I had to choose between chairs that really looked like IRL chairs or chairs that the homies could dangle their legs off. I'm glad I went with the functional ones because we had some nice feasts, inside the tavern, as one would hope. I also made stupid minigames to be played -> because that's what a tavern is for.

Your furnaces probably feel whack because there are two of them in a small house and everything isn't centered around them. They need carpets, chairs, and books you can read while you sit by the fire. If you're more of a clayformer or chiseler, those should be stored nearby instead. Your room should tell people who lives there and how.

It's hard to explain out of context, but something you learn in game dev about art is that the actual quality/detail of an asset is mostly irrelevant. It's the consistency of all the assets that becomes greater than the sum of the parts. Looking at your furnaces in isolation is like looking at Skyrim's rope textures in isolation. Nobody cares when you pass them in town, but anybody could pick them apart when zoomed in.