To extend wifi to upstairs room?

Hi

We would like to extend our wifi network to an upstairs bedroom; the modem/router is in our front room, and we intend to take the PC upstairs.

Having done a bit of research, it would appear that a wired ethernet connection is the fastest and most reliable method. However, this would appear to involve drilling and other disruption.

I’m not really willing to consider a wifi extender, as there would appear to be performance issues with this application.

So the choice would appear to be between a mesh system and a powerline adapter. I’m inclined towards the mesh system, as I understand the powerline solution is dependent on the condition of the house’s electrical wiring, and as no work has been done on it for at least 25 years, that is an obvious disadvantage.

Does anyone have any opinions on what would be the best option?

Many thanks in anticipation of your assistance.