I'm not sure of the details of that device - it says "powerline" so it may only function if fed via another powerline adapter; it only mentions client mode / ethernet output..
Something like this looks reasonable - it says explicitly it works as an AP if connected via ethernet:
Linux - because far more networking tools are available and it provides better access to data streams between network connections; windows is pretty much crippled for things like that.
This makes a whole lot of sense I have to say. This means I'll need two Pis (it is the one which I have experience with.. and setting the DHCP etc etc shouldn't be too difficult I think).
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