Thanks for the help so far guys. Here's some updates
Well, my network seems to be stable most of the time, but then some nights is awful. I don't really feel like going on an inquisition to find out which one of my 10 housemates (some of whom I don't even know the names of) is downloading something.
And then a neighbours connection is usually just too weak to keep me online.
So thinking of just paying for something more expensive. seems to be the best solution. I found a PCI card avec antenna lying around, that is also bottom-of-the-range. And that gave me a worse connection than my other thingy.
Either that or try to get a wired connection. I do have a socket in my room that I believe still roughly ends up in the room with the router, but they replaced it all with wireless so really dont think that is an option :<
More like murlurk.