Why don't you buy a cheap wifi router ?
You can connect your laptop to the landlord's wifi then share that connection to devices connected to the laptop via ethernet (in this case, the new WiFi router).
the Wifi router then shares it's connection (from ethernet) to WiFi to the tablet (or whatever other Wifi/ethernet gadget you've got). Of course, you should configure you're Wifi router to not broadcast the SSID.

With a Mac this would be painfully EASY. With Linux and Windows I do have no idea how to do it.