I gave it a try with a cheap Powerline adapter, just to test. To my surprise, it’s really working. Paired the devices in my apartment, went to the basement and surprise… network has been established immediately.
I used a TP-Link PL-PA 7017, a rather cheap one. The performance isn’t that good. Having both adapter side by side, an internet speed test only give around <100Mbps (with a regular wired connection I have around 500-700Mbps). In the basement, the performance drops to 25Mbps on one power-outlet (I guess same phase) and 5-9Mbps on another power outlet (I guess another phase).
Is this kind of performance degradation in real life range, or rather a bad Powerline adapter?
At the end, having stable 25Mbps is actually enough, but more is always welcome.