Dungen Map Help
There's a lot of RPG mapping tools about that you can search for and experiment with online but for my own DnD sessions and the like I use Illwinter's Floorplan Generator, a cheap and fairly versatile piece of dedicated software.
After actually going and reading your story (I look forward to more chapters and some cleaning of the earlier ones) I see you already have a solution and a tool. I also took notes of the dates... Bit silly of me not to notice but perhaps someone else will find the recommendation decent.