I remember standing in a rented house with low ceilings and a bed frame so tall it made the whole room feel like it was ducking. That was the moment it clicked for me, the bed sets the scale for everything else in a bedroom, not the wardrobe, not the curtains. Get the frame right and the room settles down around it. Get it wrong and you're ducking too.
A good bed sits well with plain, honest things around it. A wool rug peeking out on either side, a chest of drawers that doesn't match it exactly but shares a tone of wood or a similar weight of metal, a lamp low enough that you're not craning to turn it off. I've never seen a bed look better surrounded by things that were all bought together. It wants a little mismatch in the room, something with some age or character to lean against.
Where it falls short is in small rooms with big storage beds, or rooms you need to move through quickly, nurseries, guest rooms doubling as offices, that sort of thing. A storage bed is wonderful for a household that's short on cupboards, but it's a commitment, you can't easily swap it out when you want to rearrange, and a tall upholstered headboard can make a low ceilinged room feel like it's pressing down on you. If the room is doing three jobs already, keep the bed as plain and low as you can.
Measuring up matters more than people think it does. Don't just measure the mattress size, measure the full footprint of the frame, including any footboard, and leave at least two feet on each side you need to walk around, more if you're making the bed regularly and need room to move. Check the height of the frame against your existing bedside tables, not just for looks, but so you're not reaching down or up every night. If you can, stand where the bed will go and swing your arms out, that tells you more about elbow room than a tape measure ever will. And always check the door width and any tight turns in the hallway before you commit to a frame that comes as one solid piece, because getting it into the room is a different problem than choosing it in the first place.
It suits a home where the bedroom is lived in all day, not just slept in, where someone reads in it, works from it occasionally, and wants the one big piece of furniture in the room to feel solid and unhurried rather than borrowed.