I agree with Mike about the desk placement.
AFA what/where treatment should go...there's not going to be some significant position differences...like a little this way or that way...rather, just consider a good amount of broadband panels and also some LF traps, especially in the angled corner where LF might get trapped more.
IOW...put LF traps in both corners...but you might need a little extra in the angled corner.
At any rate, don't go nuts straight off. Start with some basic panels at reflection points, the back wall, the corners, and of course the4 ceiling...and don't forget even the front wall on either side of the window...but you don't need to immediately load up the whole room...though TBH, with small rooms like that, stuffing them and making them dead is generally going to work out best. A pretty dead room creates the illusion of space...of course, you have to add you ambience artificially, but at least it's controlled.
You might even consider "squaring off" that weird corner...but save that as an "all else fails" option. You can also put lots of "stuff" on the side to kinda balance out the angle.