I’m not sure I would separate the rooms. It is so small that I would definitely look for a loveseat and look for items that can do double duty. An ottoman with storage perhaps. Use vertical space as much as possible. Do you have any pictures or a layout?

I've seen floor to ceiling drapes used, and large see-through (or not) bookcases to separate spaces. The latter also provides vertical storage, which is important in a small area. There are lots of ideas at this link also:

https://www.apartmenttherapy.com/categories/small_spaces

Make a partition. You can use a screen or a bookcase or matchstick blinds hung from the ceiling. You might need some privacy if people come over.

Ikea's cases yes, but unmoveable. Curtains can be moved aside for a long view when you want it, or even air flow...

In my ideabook called Studio I've saved photos/ comments from designers.... 2" wide aluminum in all widths. More elegant possibly with sheers with fullness.

[https://www.houzz.com/products/roomdividersnow-ceiling-track-sets-for-spaces-up-to-36-wide-medium-6ft-1-prvw-vr~50480367[(https://www.houzz.com/products/roomdividersnow-ceiling-track-sets-for-spaces-up-to-36-wide-medium-6ft-1-prvw-vr~50480367)

black silver gold or white:

https://www.houzz.com/products/roomdividersnow-hanging-curtain-rod-with-brackets-brushed-silver-108-168-wid-prvw-vr~15997216

…. the kit:

https://www.houzz.com/products/muslin-hanging-room-divider-kit-ivory-small-a-8-h-x-3-to-48-w-prvw-vr~15918233

All these in different sizes, etc...

could have a good look if art placed nicely on it somehow.... tapestry / quilt:

[https://www.houzz.com/products/6-1-4-tall-take-room-divider-black-prvw-vr~10959052[(https://www.houzz.com/products/6-1-4-tall-take-room-divider-black-prvw-vr~10959052)

Sliding room divider, but it’s pricey...

Some great small apartment ideas:
- IKEA has a terrific gateleg table that can tuck out of the way and take up almost no room, and be opened up partially or fully for dining.
- you might like a lift top coffee table, which can serve as a makeshift dining table or laptop/desk/workspace.
- if I were you, I wouldn’t try to fully separate spaces, but rather maybe use a cube shelf (perhaps horizontal?) to provide a little visual separation while also providing practical storage.
- in general, definitely think vertically. A hanging coat rack, a hanging pot rack, etc.

When I lived in a studio, I used the back of my couch as a divider. It did make the space seem smaller, so I changed things up occasionally. Make sure your furniture is small in scale. I saw today the Pottery Barn has a tab on the home page for apartments.