what a cutie!
I always left Mort a salad and eventually she would nibble bits. I'd trick her sometimes and stick a leaf of something in her mouth at feeding time.
But she got keen on it around 6 months. Sometimes I see her bound over to it in the middle of the day and eat a bunch. so cute. She knows when she needs it and will have days on or off it depending on her mood but it's always there.
Agree on the tile flooring after reading lots of tips here. Newspaper or paper towels are good too if you want something absorbant for poop while you're out. I have roofing slate on Mort's floor, but a blanket for her to burrow under if she wants to do that. (in addition to the cave, it's more for the burrowing/snuggling under action she likes to do sometimes)