Yea, my WiFi situation sucks! To add to this, we have DECT 6.0 phones in both apartments, and my desk is less than 10 feet from my neighbour's microwave. It would totally fry the WiFi connection to my laptop every time she used it. Thankfully, she replaced it with a new inverter model last year. The real world is nothing like the lab, so I have no delusions about getting advertized peak transfer rates. At least I've been able to tweak my WiFi settings so that I can maintain a reasonably reliable connection. Regardless, the next time my wife decides the office needs to be painted, I'm wiring the whole place for Ethernet!
5GHz is not an option as none of my client equipment is dual band.
I actually have a wired connection between the two apartments. When we bought the second apartment, I managed to get into the building's telephone closet and tie together the spare telephone lines for the two apartments (neither were connected to the TELCO). This gave me a single twisted pair connection between the two apartments, which we've be using to extend our home phone line into the office. A couple months ago I found the needed media converters (PLANET VC-201A), which allow Ethernet to be transmitted over a single twisted pair using VDSL2. One VC-201A acts as an interface between the DIR-655 in the office and the spare phone line. Another one acts as interface between the spare phone line and the DAP-1360 in the other apartment. So far this has worked quite will, though there is one side issue I'm still trying to resolve.
Larry ....