You will almost always get better internet performance out of a cable (ethernet) connection than by using a wireless one. This is because you have smaller transmission losses by cable than by wireless. This is why if you ever get into a dispute about quality of service with your ISP, you will be asked to connect by cable to carry out their checks !
Wireless routers have their advantages. They make sharing a single connection very easy and they allow much greater freedom of location. There are some five or six internet capable devices in my house - not all of which are in use at any one time - and a router allows us to connect them as and when required without having to re-route cables.
Once upon a time, I lived in similar accomodation to you so I imagine your room is fairly small and with one desktop or working area - ideal for using a cable connection. You can't move very far and still be in the room ! The fact that I had a typewriter at the time is irrelevant.
If you use your laptop primarily within the confines of your room, cable is great. If you want to take your laptop to the social spaces or picnic outside and still want connectivity, wireless is more convenient. But as the Animal has just said - one cable connection = one device.