“If the accommodation is significantly different from the photographs, leaving without giving notice may affect a refund request.”

Under the law, this statement is TRUE.

When the accommodation does not correspond to what was advertised, leaving without first reporting the situation may affect a subsequent refund request.

Before leaving, you should document the differences, contact the platform through which the booking was made and give the host an opportunity to resolve the problem.

What does Caiado Guerreiro recommend?

Document the situation with photographs or videos.
Contact the platform and report the problem in writing.
Give the host an opportunity to offer a solution before leaving the accommodation.