What do you do when the Home you're sitting in is less than desirable? (Dirty, Smells, Bugs) But the Pets are wonderful. (disclaimer the pets are safe, in good health and are clean.)?

I understand that not everyone is super clean. But I have been on a job recently (sitting) where the home was very unclean. When I was at the meet and greet we did not tour the whole home (which is fine, i'm not moving in) and I noticed an odor of urine. I brushed it off because I have see it before. But the day of my stay while the home was tided up a bit the smell was almost unbearable (to the point it game me a headache). I finally saw the bathroom which was horrendous and I was afraid to touch anything. The worst part was the kitchen... I moved something on the kitchen counter and there was a roach (Alive and scurrying away). In addition while there we (the dog and I) heard scratching like an animal in the walls or vents or something. Something that sounded like a mouse or rat. The family is nice the pets are safe and taken care of (good health); but I'm afraid they will call on me again and I just don't know if I can stay in that house again. HELP what do I do? What do I say? I never want to hurt anyone's feelings but I don't know what to say.