How to tell a guy I’ll never sleep over his house (parents house)?

Anonymous
He’s a very sweet guy , but his parents house is disgusting. His parents are hoarders, his mom is random of when she walks into his room, he sleeps in a twin sized bed (not suitable for two people) on top of the fact that he has a very hyper dog that he lets randomly crap and pee on the floor (on a pee pad of course but still) because he allows his dog to do all of this his house smells. He always insists on me staying over but in reality I’d never get a good nights sleep here. I don’t want to hurt his feelings because I know his parents living situation isn’t his fault but I couldn’t see myself comfortable sleeping at his house and my sleep is important. How can I address this nicely?
How to tell a guy I’ll never sleep over his house (parents house)?
7 Opinion