Well! If you have another room for the TV than that is your answer. Then, you can move the sofa to that wall and add two small club chairs across from it. If you go the chair route, get ones that swivel as you have the window seat in one direction and the dining table in the other. Easy to swivel and converse! I am not a fan of the TV being in the living room if there is another place that it can go. I wouldn't rush to take down the half wall. You will need someone competent to match your existing hardwood. Your kitchen looks like a nice size. Is there a table in there? Or can bar stool be put on that side if you replace the counter? It looks like it is a different material than your counters anyway so you can find a material similar to what is now there. ETA: When you do look to buy furniture, look that furniture scaled for small spaces/apartments. It's sometimes hard to judge in the store so take a tape measure with you.

You could even get a piece of plywood or something and paint it the color of your wall and tack it over the landlords door...it will fade into the background. If you move, you can take it down with no problem. A couch and couple of chairs will give you lots of "decorating room" and you can make a cozy room.

I don't mind the table and mirror and can't really think of anything besides art that would fit on that wall. Can't see the table details well but could it be painted? How about red to match your lovely door? What would say "fresh and cozy" to you for that space? Have you thought of a new light fixture? A runner and a larger rug in the entrance could look good. I don't find the clock visible from the door to be welcoming so I'd be tempted to remove it.

Here's a site with small corner tables, plus Wayfair has a good selection. Measure your space. https://www.google.com/search?client=safari&channel=mac_bm&source=hp&ei=pd0SYOrGI4CYwbkP2LWA-A8&iflsig=AINFCbYAAAAAYBLrtQz-KwR2I--j0F0oMiMYX0N0J5jS&q=corner+table+for+small+spaces&oq=corner+table+for+tiny+&gs_lcp=CgZwc3ktYWIQARgAMgYIABAWEB4yBggAEBYQHjIGCAAQFhAeMgYIABAWEB4yBggAEBYQHjIGCAAQFhAeMgYIABAWEB46CwguELEDEIMBEJMCOggIABCxAxCDAToICC4QsQMQgwE6CwguELEDEMcBEKMCOgIIADoFCAAQsQM6AgguOg4ILhCxAxDHARCjAhCTAjoFCC4QsQM6CwgAELEDEIMBEMkDOgUIABCSAzoFCAAQyQM6CAguEMcBEK8BOggIABCxAxDJAzoKCC4QxwEQrwEQCjoLCC4QxwEQrwEQkwJQmRdYsVhg93doAHAAeACAAXOIAfYMkgEEMjEuMZgBAKABAaoBB2d3cy13aXo&sclient=psy-ab