Could someone (who knows) please answer this one?

i.e. 没有洗手间在这儿

I think locations come before the verb in chinese

這裡沒有廁所 is way more common than 洗手間

That implies there is a bathroom, it's just not here but elsewhere.

And 厕所, yes.

这儿不在洗手间 = here is not at the washroom

So, sorry, doesn’t quite mean what you want it to.

It’s possible that 这儿不是在洗手间 might be understood but I think it still sounds a bit odd. Might be better without the 在，but you’re still missing “There is”.

Translating “There is” you really need 有。I think.

I meant 洗手间没有那儿