Yeh, I used donjon; AD&D Random Dungeon Generator to randomly generate a dungeon initially to just give me some rooms to start working on as I had no idea what it was going to be. As I developed the lore and decided it was going to be a monastery then the layout completely changed, the corridors pretty much got removed, but the initial map still left me with a nice shape to base everything off. Sometimes just getting shapes onto the page is enough to get you going, especially when you have no clue the direction you're going to head in