As of
THIS THREAD where Harry and Greg visited previous!Harry's cave, Harry has set-up a pretty hefty spell that hides the four doors to the four rooms at the end of the hall on the top floor of the bar. These rooms are - Harry's cave, Harry's new room next door, Adam's room and Bethany's room.
Basically - even if your character remembers that the rooms are there, when s/he gets up there and near the rooms, the memory will become fuzzy and s/he'll be a little disoriented.
It's a kick-ass illusion with mirrors, a decent glamour and a subtle 'fuzz the memory' spell.
Plus - Harry's locked all the doors - mechanically and magically. Even if a character were to find them, s/he couldn't get in. Bethany and Adam are the only exceptions - they should still be able to get into their rooms with a little effort... if they find them... if they even wanted to.
There's a reason for this - Harry went up there, because he needed to sort out all of the stuff in his head, and he didn't like the vibe he got when he was there. It was negative and dark - not quite slimey, like icky dark magic, but it wasn't 'nice' - so he thought it better to close it off than to leave a gaping hole of negative energy swirling around up there as part of the bar - especially after the Tutu Day to free the trapped souls.
Harry is happy with his life the way it is now; he doesn't like parts of it, but the whole point of him going back and doing it 'over' was so he didn't end up as the guy who was stuck in that cave. He's not that guy anymore and he doesn't want anyone else to have to know that part of him if they don't have to. He hated his life then - except for those few months at the end when it didn't suck - and he doesn't want to remember it as more than a 'lesson' of the past. He's done. He's not that person and he never will be, so he's closed off the one thing left at Milliways that still pulled him toward the previous!Harry. He won't bring up his past - aside from a few discussions or apologies he feels he needs to make - to anyone ever again. Greg knows about it, Alex knows a little, everyone who knew previous!Harry obviously knows, but Harry isn't going to discuss it with anyone else. He's done with that part of his life and he's going to be the Harry he is now.