What rules do you have for being willing to stay in someone's home as a guest?

As I get older I have more rules.

I no longer want to stay at someone’s house if they:

Have a dog.

Smoke.

Their child has to give up their bed.

If the house is so dirty There is too much ick factor. A pile of clothes or papers don’t bother me, I mean mold and dirt.

Probably I would break one of the rules if it was in a very expensive city and a hotel was extremely expensive, but more or less I don’t want to stay in houses that have any of those situations.