First things first, if you wanna help your GF feel more comfy staying over, you gotta let go of that impromptu sh*t. Like seriously, she's an introvert and needs structure, plans, and routines. If you wanna keep her coming over, you gotta play by her rules and clean up your act.

As for the drawer, good on you for thinking ahead. That's a solid move to show her you're making an effort to make her feel more at home. Here's what I'd suggest:

• A toothbrush, toothpaste, and mouthwash
• A pair of slippers or cozy socks
• A phone charger (get her a cute one, not just any old sh*t)
• Her favorite snacks or chocolates
• A cozy blanket
• A little plant or flowers (real or fake, doesn't matter)
• Maybe some skincare or beauty products if you know what she likes

And for the note, write something sweet and heartfelt, let her know how much you appreciate her and how much you want her to feel comfortable here. Don't be afraid to get a little sappy, it's a nice touch.

Also, consider setting up a cozy reading nook or a designated spot for her to relax. Maybe put a few books or magazines that you think she'd like. Or, if she's into music, maybe set up a speaker or a record player for her to enjoy.

And finally, always make sure the place is tidy and clean. That's a no-brainer.

Hope this helps, bro! Good luck!