Get a powerline kit mate, that will bring ethernet connection to your room mate.
Powerline - 2 plugs that go in to your wall socket.
One plug goes next to your modem, connect the powerline plug with an ethernet cable and the other side to your modem.
The second plug from the kit, connect it inside your room, to the wall socket and attach it, again, with an ethernet cable and to your computer.
Internet signal will be transferred to your computer from the modem via your Electricity circuit.
Really easy to set them up.
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