How Can I Improve Wi-Fi Connectivity in My New Home?

Moving from a 3rd floor to a 1st floor setup really complicates things. Ideally, running an Ethernet cable from the main router down to your room would solve the issue. If you let your landlord know about your struggles with the current setup, they might be willing to help out. An Ethernet run can go up to 100 meters, so you should be in the clear with distance.

You might consider investing in a mesh network system like Eero. They work great in providing coverage throughout larger areas of your space.

I've heard of similar cases where thick plaster walls caused terrible Wi-Fi due to interference. One person I knew had to install multiple repeaters to get any decent connection. If your walls are that thick, it might be an uphill battle. Talking to your landlord sooner rather than later could be key.

I’d recommend trying a powerline adapter first. They often outperform extenders. If that doesn’t fix your connectivity, maybe you can convince your landlord to let you run a long Ethernet cable along the wall. Both of these solutions are usually affordable and offer more stable connections.

If you have coax outlets available, checking out MoCA adapters could be a great option. Otherwise, powerline adapters generally work well if you're on the same electrical phase. I’ve had an old home with aluminum wiring, and I was able to get 200mbps using those. But if you have unused phone lines, there might be a way to use them for an Ethernet extender, although speeds may be limited to around 30-50mbps.