You can buy a portable unit for like 300e and seal the window with a piece of plexiglass with a hole in it. It's a pretty low barrier.
Midea has released the Porta split a few hears ago which was a game changer for many people. I currently have one cooling the bedroom.
Midea put quite a bit of money into ads, sponsorships, etc but they also simply make a really good product.
I've had a monoblock AC before. Same BTU as the Midea one I have now. It was significantly louder, took way longer to cool the same room, and used more energy.