Speaking as the husband of a landlady, you need to put this landlord behind you.
If you've been there twelve years, you should be the landlords. When you find your next place, consider buying an apartment building. You get all the headaches of ownership, but you can hedge against inflation by raising the rent occasionally.
I was a landlord years ago. They moved in the middle of the night. And took my air conditioner with them.
Ditto.