Depending on router of course; You can make a guest network, limit guest clients to themselves (block them from communicating with other guests and most imprtantly; Cant access with your main network). I've had a few guest networks, but with QoS off, and there doesn't seem to be a bandwidth cap. Which is annoying.

Hi, so you need a wireless router which supports bandwidth control for the guest network. 

As far as I know, the QoS has been applied to many routers, which means we can setup different priority levels for different devices/applications.

While some router still supports bandwidth control, like the TL-WR940N, it supports bandwidth control for guest network; you can refer to the user guide for more info.

https://www.tp-link.com/en/support/download/tl-wr940n/#video 

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