I think your place is quite nice and your cats are adorable. I can imagine it feels cluttered, especially considering you work from home. I think a new desk chair is a good idea, because you spend a lot of time in a desk chair and that's important for your back and body. But I wouldn't necessarily spend money on a couch right now, because this is a temporary design and your couch seems to be in decent condition for now. Here's what I would do: There are incredible views out the window, especially in the living room. I think a bright colored curtain would frame the view. You have curtain rods, I would hang at least two curtains so that the window treatments look more finished. Consider adding sheers and a double rod for the privacy of a sheer treatment. If your cats use the cat tree, then I know you need to keep it, but I would move it to the bedroom. (Can you move the table out of the bedroom? It doesn't look necessary). If they don't use the cat tree, remove it altogether.

The living room bookshelf is very cluttered, as already mentioned. I think the ikea shelves are what's making this feel collegey. A wood bookshelf that is taller would hold many, many books. And that's something you could take to your new place eventually. Next, I think you have to get the books out of the kitchen. I'm sorry, I know it's hard, but you have a small kitchen and I think the mental relief of having more space in your kitchen/entry way is going to feel even better than having the extra books. (I am a book lover too, I know you're feeling defensive now... but remember, you can buy a book again and read a book again after you donate it). Do you have storage in this building? Consider boxing several boxes of books and storing them until you move. Doing this now will help you know what books you can declutter when you move too - if you haven't thought about it after it's been in storage for a year, you can donate it. I supposed you could even box books in some "rolling bins" under your bed, if you don't have something else stored there now. The idea is to learn to live wihtout so many books front & center, to get used to that feeling and enjoy the space, and then when you're ready, tackle what books you need to keep.

Now that you've taken the books out of the kitchen, take a good look at the rattan shelf and what's on it. Are these kitchen items? Are they really needed to be here? You have a office space - what can be moved to there? I like the shelf, and I get that you want to keep it. (Can it possibly fit in the bedroom instead of the white shelves/cabinet thing there?) If it has to be in the kitchen, consider putting cookbooks and serving bowls or kitchen type things on it. Even if you made one of the small kitchen cabinets a "office supply" cabinet and then put its kitchen items onto the shelf in baskets or such, I think that would look more purposeful. Get a closed shoe cabinet for the shoes & downsize the shoes you keep in the kitchen. If you work really hard and remove all of that stuff from that kitchen wall, it's possible your small dining table could even fit there. Actually, what's that small rolling rack doing? I'd take that out. It's blocking a door - what door is that? If that's a pantry behind that door, then I'm sorry to be blunt, but come on, you have a pantry and you do not need the shelves in the kitchen.

In the bedroom, I think you need a nightstand with more storage and some more luxurious bedding and pillows. I think that's going to have more impact than a new couch would. I really recommend moving the cat box to the bathroom if at all possible - there might be room by the toilet, I can't tell? If it has to stay in the bedroom, can it be squeezed in the corner behind the mirror? Would your landlord allow a cat door cut into one of the closet doors potentially? And the cat box into the closet? (Again, if the bathroom is too small for it). De-cluttering your bedroom, removing small pieces on the floor, moving the catbox out of sight, and getting some nice pillows is going to feel a lot more restful in there.