Can you take a picture standing in front of the windows looking towards the kitchen? Man, I thought my last living room and current living room were difficult to work with because of doors, open kitchen and windows but I think yours takes the cake :)

Hahaha right?! Ok not the best photo but here is the pic looking toward the kitchen

(Those chairs will not be there)

I think the full wall will need to hold the TV. I would try to create a wall unit there that has an incorporated desk on the window side. A desk chair can double as extra seating if needed (and you have the window view when working). A small apartment sofa floating facing the full wall such that there is a small walkway behind it to get to deck and bedroom. If you can customize a bit, I think a full wall unit can also have a pull down table that you can use for dining if you have more than just 1-2 ppl (for which you can eat at bar maybe). Look at Ikea or somewhere similar with a modular wall system.

Gcubed idea could work. It's hard to know exactly because you need room to walk around a couch and you don't want your tv to be 3ft from your face. Another possibility is couch in front of windows, round coffee table so it's easy to walk around it, tv where your dining table is (i assume it's about 36 inches wide) so you can mount it on one of those mounts that can come off the wall and angle it depending on how many people you have over. I would nix the tv stand or get an open one like a console table and put some small poufs under for extra seating or to put your legs up when you watch tv. My sister's apartment has a similar ledge between her kitchen and living and she has her desk in front of it and just puts knick knacks on the ledge since it's too small for your knees to sit in front of. If you did that layout you may be able to get a bigger couch with a chaise for extra seating. I'd also look at realtor.com or even airbnb and see what they have in small houses, they get pretty creative in Galveston condos with 490sqft. IKEA and Target will be your friend if you need some new furniture. I'd also get those blinds that you can push up or down so you can get some privacy but still let light in on the top part without creating a glare when you're trying to watch tv. You could also get a long desk and have the left side be where you computer goes and right side for tv if you don't want to mount it.

May be sectional facing wall with TV and the kitchen would be better choice here.

Or sofa and couple chairs instead sectional