I wouldn't install classic switches nowadays, as already mentioned here. In the guest toilet even completely without a switch. Ceiling light with integrated motion/presence sensor, done.
Sure, that's also quite "great" when the light goes off every 2 minutes during a toilet visit because you're sitting very quietly.
No, I definitely wouldn't want that there.
Otherwise, we also have switches inside, including in the bathroom and toilet. Although if I could plan again, I would rather have it installed outside the guest toilet.