Yeah, I did a check a couple days ago and saw that we have a fuckload of hammer-in anchors, but zero screw-ins. There's also legitimately only one place in the hallway I can even hang the damn thing, barring trying to drill holes in a fire door (which additionally wouldn't even work that well with how the door opens).
And despite having been bought a drill at some point, I don't seem to have any actual drill bits. There's a hole saw kit in the toolbox for some mysterious reason, but no standard bits. I don't even have an awl to make holes with.
Wall seems to be basic gypsum drywall, about 4" total thickness separating the bathroom from the hall. Can't say for certain that it's hollow on the inside, but it sounds like it.
And yeah, the entire zone I can use to hang the coat hook is less than 60cm across. There's fuckall backing on that side since it's just a gap between the bathroom door and the more solid wall of the apartment complex hallway.
In unrelated news, she spent a while trying to convince me that I needed some things from the store last night, because she (loudly and mournfully) wanted some milk chocolate, but she didn't want to go to the store herself. This was around 10pm, since shops close at 11.
She said "haha, kidding, just kidding" at the end of every sentence though, so it was just a joke, bro.