How close am I to Falz?

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Wow. Well you seem you made it really far. You were actually just one room away from Dark falz once you make it to that room. It's always the longest hall you will see in Ruins, followed by a room with an ice crystal in itAnd after that is a huge room where you fight a bunch of monsters (The room you said you were in), and from that room the dark falz teleport is straigh ahead. Although you might want to get some treasures from the boxes tot he left and right.

And no. If you wait a while in a room that was cleared of all monsters, they wont respawn. It might have been a monster you missed. That and the fact that dark gunners are stupid and take a long time to spawn.