Ok....maybe time to reveal my slightly geeky side...
We have Fibre in through the wall to the fibre connection under the stairs through to a separate hardware VPN Gigabit router, switch(non managed), and eero wifi 6 routers on mesh, with Cat6 cabling to several rooms including my office. There's a 16TB qnap server in a RAID 10 configuration as well which keeps backups of all our computers and runs a media server.
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My cabling isn't very neat which I do appreciate could be better.
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The original question was the speed of the wifi, which is dependent primarily on your wifi set up rather than the fibre speed in most cases. Generally using the wifi built into the router will not be sufficient in a stone built building, in part because for many people the fibre is just brought through the wall so the wifi is at the edge of the house. Wifi extenders will eat into your bandwidth and speed unless part of an overall mesh system or using more than one channel to connect to your router. If you can run a cat 6 cable from the fibre modem to the router further into the house that will help, but generally a mesh system with triband will be necessary to get the better speeds from fibre in a stone built building. My preference is to use the mesh in bridge mode and use the DNS on the router, that does mean you don't get some of the clever software some mesh systems have but it does make it fast and reliable.
I had been using the linksys mesh but the software and reliability was patchy so I switched to the eero pro's earlier this year. I am under utilising the new VPN router and plan to add a back up mobile internet connection which can switch over or act as a merged connection for the WAN.