It's kind of odd but where I live people say half-bath or half bathroom for a bathroom with only a toilet and sink. We also refer to bathrooms as a bathroom, men's room, ladies' room, restroom, etc because toilet comes across as a little impolite or mildly crude. I really only hear children say toilet and that's still pretty rare.
TLDR: Americans are weird and think the word toilet is gross. (At least where I live.)
Where are you from exactly? I live in England and toilet is the normal word, however saying 'going to the bathroom' in the toilet context is more for children and rather strange. I say it often as a calque from Polish "need bathroom", however if you just want to wash your hands, you say that, and not mention where you're going exactly.
The English translation feels odd.
If I want to know if something or someplace is 'here', at the location I am - 'I ask : Is here a toilet' (more likely 'do you have a toilet here)
If I want to know if something is at a certain location I am not at the moment, I ask 'Is there a toilet?' or 'Do they have a toilet there'
I am not a native speaker - but the structure : Is there - here sounds pretty awkward. Am I right or do I miss something?