The binder nobody reads, and the QR people do scan
A laminated binder on the kitchen counter often goes unopened, or gets opened only after the guest has already messaged you to ask for the Wi-Fi. A QR code on the fridge, the back of the door or the key tag is where people actually look, and it opens the manual on the device already in their hand. It is also easy to navigate: the viewer lets guests jump through pages and zoom in on the diagram of the fuse box.