Every style runs at more than one level, and the level is about the steps rather than about you. If you pick wrong, the teacher will move you and nobody will mention it again.
Cuban salsa and Dominican bachata, taught in pairs but never with a fixed partner — you rotate, which is how you learn to lead and follow anyone in the room.
If it is not here, ask at reception — someone is always in from five.
Pick the class you are most nervous about. That is usually the right one.