Usually, it's medieval or other historical fiction or biography, in bed, snuggled up with my dogs.
If it's cold enough for a fire, I'll move to the sofa by the fireplace.
If it's sunny and mild, outside in the swing.
The only other time is in waiting rooms.
But I also listen to TTS on the Kindle while driving or out on a walk, even through a store - just using one earbud so I'm not totally oblivious.