Bob - the nature of this question is one of the main reasons our industry is still viable. When someone first hears what I do they often ask, “well with everything going wireless, doesn’t that mean you won’t have a job soon?”
The more wireless increases peoples adoption of technology, the more people will rely on technology and then the more they will rely on the people who actually know how it works.
Your question does not have a simiple answer. What product or technology should you use? It depends.
Lutron has developed RadioRA2 to deal with the inherent problem of retrofitting lighting control. It uses a proprietary architecture blending power line and wireless mesh networking to create a stronger and more reliable lighting control system. I bet it would work well in your apartment. But it only handles the lighting/shades.
What about portable phones? Panasonic has the ability with their system to attach a cell station - which can be setup with one of their proprietary portable phones to scan and test the wireless communication on their frequency. If you have dead spots, you just add a cell station (hard wired) to that area.
Wifi? Try a wifi scanning program. They’ll reveal the chatter or noise in many frequency ranges that could interfere. Although it sounds like you think the problem is that wireless does not penetrate far, perhaps your problem is the opposite - too much traffic.
You wont know until you scan it.