The problem with my house built in the 1970s is the number of neighbouring WAPs that are visible. Judging by the names some are over 100 metres away.
It has proven impossible to choose a free channel on 2.4Ghz. Some WAPs do not broadcast their SSID. Others do automatic channel hopping that seems eventually to land them on my channel - as presumably the least populated. The latter often seem to have a maximum signal strength indication - so why do they not see my WAP as physically too close for comfortable sharing?
I have now reverted to Ethernet-over-mains.