However, it's important to know that loo is a very informal term and not typically used in formal situations. It's more common in casual conversation and among younger generations.
In formal contexts, you would use the more standard terms:
* Les toilettes: This is the most common and polite way to refer to a toilet.
* Le cabinet de toilette: This is a more formal way to refer to a toilet.
So, while "loo" is understood, it's best to use more formal terms in formal situations.