What
@WJA96 said and meshing access points cuts your WiFi speed in half, two of the four antenna are used to communicate between the two access points (assuming they even have four, many don’t) leaving only two to deal with connected devices.
Your real world 150-600mbps drops to 75-300mbps.
You don’t need to run 6 cables to every room but a few strategically placed runs to get cables to access point locations does the job for 99% of people.
I have 3 runs which cover my house:
Living room to attic, external behind a gutter down pipe.
Attic to spare room office
Attic to landing access point
That’s it, the vast majority of my devices are wireless. The only things which are not are a desktop pc, a NAS and the wireless access point.
A 100 year old semi is all the more reason to run the cables, the thick walls will destroy wireless signals and the mesh node will be very slow. You’ll have loads of opportunities to hide cables behind soil pipes, gutter down pipes as all of that is external on an older house. You may also have proper floor boards or even a ground floor crawl space which can easily be taken up and cables ran underneath.
You’ll only need one or two of runs to connect up the wireless access points, that’s it. You just have to think outside the box.
For example, the previous owners had a Sky dish installed and it’s on the opposite side of the house to the living room. The original installers pinned the cable around the outside between the first and ground floor. It looks ****. Instead I’ll be punching through into the attic, running the cable around the attic and down behind a gutter pipe to the corner of the lounge and 99% of the cable is hidden.