Obviously, the cast and crew may have loved a chance to continue the Van Helsing story indefinitely, but in a world where Syfy has abruptly cancelled shows with no opportunity to fully wrap up the story, this is the best possible outcome.
Star Kelly Overton posted a series of emojis that presumably showed her approval of the opportunity to finish the Van Helsing story as well.
Not only will the team get a final season, they have a solid chunk of lead time to figure out how to conclude the story before the season premiere.