Can you draw out the space and provide measurements please. Include the wall with the door on it and what the measurement with the entry door open against it is as well. Will the bed fit on the other wall?

Whichever wall the bed goes on a window will come into play but by flipping it you may be able to open up the windowless wall for storage possibilities.

Regardless I would curtain the wall the bed is on to disguise the offset window. This room is close in size abd layout to yours (they have a queen bed so it seems more roomy) and they have used drapery panels to help create the illusion of a wall. Shown open

and here they are closed as the headboard wall

I will draw up a floorplan for you today. Love the ideas so far.

Having a bed in front of a window drives me nuts. The suggestion to install a fabric curtain across the entire wall seems like a sound one. You would have to make the fabric heavy enough to prevent a bright spot where the window is though. Otherwise, it would be obvious that you are simply trying to cover a window.

I could barely do a queen in a 10 x10 room but as far as the off center window put drapes across the whole wall use blackout drapes . The down side no fresh air . Post a pic of the space always when asking for help .Pst it in a comment on this post.

I swear this was posted with pics. No way I would give up a king bed. Love that space. Definitely do the curtains across back and call it done.

Not sure how these disappeared/ but here is the room in question!

I'd look for the slimmest side tables (if you need them at all) and swing arm lights to fold back when not in use.

a tall chest of drawers for between the mirror and door.

paint the walls and ceiling a creamy light color including the trim(s)

Contrasting trim just cuts up the room and draws attention to the trim.

let your bedding be the pattern & color in the room.

an area rug if you need it.

Wallpaper or dark walls will just make it feel smaller.

Simple inside mount blinds, (the same color you choose for the walls and trim), on the windows. A large framed canvas art on the wall between the window and the mirrored door.

there are all kinds of great swing arm wall sconces to choose from Amazon Wayfair, etc.

... a white ceiling fan to disappear into the ceiling rather than contrast.

OR a set light this low profile fixed.

https://www.wayfair.com/lighting/pdp/ebern-designs-botnick-armed-sconce-w110203381.html?piid=350136534&auctionId=e644596e-4e1d-4ea3-b12a-9d93f3de967c&trackingId=%7B%22adType%22%3A%22WSP%22%2C%22auctionId%22%3A%22e644596e-4e1d-4ea3-b12a-9d93f3de967c%22%7D&adTypeId=1

I agree with adding the wall of curtains behind the bed. To save space on smaller nightstands, consider hanging lights from the ceiling or adding wall sconces that come from behind the curtains. You can also hang art on the curtain wall for more interest.

With all the movement from the curtains, I'd keep everything else pretty clean and simple.

I'd stick to 18 to 20" wide nightstands with drawers for added storage, then a taller chest of drawers on the wall facing the bed. I presume the mirrored door is the closet, which tends to be pretty small in older homes. Perhaps some underbed storage drawers for out of season clothing or extra linens would help.

I would do the following

really if your wall is only 10' on the one side you really can't fit a king the other direction. To make the most of the space I would do a kind bed that has pull out storage drawers and to be able to operate those drawers I would do floating bedside tables. I would also use two pendent lights from the ceiling because the space you will have on those bedside tables is tiny so best to not use a table lamp because there simply isnt enought room. Dress the back wall with drapery panels to the ceiling. If you cant hardwire the lights take advantage of those draperies because they can hide the cords behind them and you can swag the lights in front. You can also hang art work from the drapery rod by chains. Paint the room a nice calm white. I worked with colors based off your bedding. Anchor the space with a neutral area rug. on the opposite wall i would look for a wardrobe on the shallow side to further extend your storing options. Replace that fan. Its awful!

"Our style is somewhere between Midcentury and Americana. "

I caught this after i did a mid century room. Americana and Mid century are two different things. Not sure what youre trying to describe here.

this is americana

IMO there is no way that a wall of curtain will disguise the off center window.

Asymmetry is not a flaw. Balance the window with some art and your room will look more interesting than an oversized wall of fabric

@BeverlyFLADeziner posted this idea for a basement https://www.houzz.com/discussions/6562311/here-s-a-clever-way-to-address-window-treatment-in-a-basement

You could use the same concept to create a faux second window to balance the room. Would finish with shutters for both. But I do like the wall of curtains. It looks good IRL and since most people don't have guests in their primary bedroom, no one will wonder why light comes through in only one spot during the day.

You may need to move the bed away from the back wall. The heater might make your heads pretty warm. Could you have heater moved to another wall or have it disconnected/removed? Don't know where you are located.

Agree with other posters regarding off-center. Asymmetry is often interesting. Recommend embracing it.