I have Asus RT-AC1200G+ router downstairs with my home media server connected with cable (Video streaming, NAS, VM streaming).
On ground floor WiFi reception is very good (144MBit on 2,4 and over 350MBit on 5GHz). On second floor I have poor signal (unstable 60-80MBit on 2.4, very unstable 15MBit on 5GHz).
What I want to have ground-floor quality signal on second floor.
Router repositioning isn't an option - this is where internet cable is. Normally I would lay additional ethernet cable to upstairs and buy a good access point - but property owner strictly forbids doing it on my own and he demands ~250$ for it (+cable&AP price of course). House is pretty old, so PLC adaptor probably isn't a solution (however I haven't tested it yet).
My question: is there a better solution than paying an owner to lay an ethernet cable for me and buy AP?