Help! Should I let 9yo ds go to his first sleepover with parents I don't know very well and who seem a bit flakey?

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I'd really appreciate views. 9yo ds is friends with a boy who's perfectly nice, they go to school together.

I've met his mum once, she came in for a cup of tea when dropping her son for tea here. There are 2 men 'around' but I don't know who they are. Ds's friend's dad is dead, sadly, so I've no idea of the relationship between these men and the mother, I think one might be a partner.

Ds tells me their house is a bit, erm, dirty and scruffy. I haven't been in but I was quite taken aback when I stoood on the doorstep a while back: the hall was absolutely filthy, great piles of yuk. The friend smells sometimes. Oh god, I sound so horrible and judgemental but I'm anxious about letting ds sleep over because of the above snobbery but also because I don't really know these people.

Ds says he will come home to sleep if it bothers me. HE said "but you leave me with a baby sitter" and I pointed out that a) they're CRB checked b) they have 2 references c) it's not overnight

What would you do? He's going this pm so QUICK! TIA.

my ds's are 9 and 10
i would let him go, give him a bath when he comes home
addmittly my boys have never slept over at friends houses as they have never been asked but they did go on a cub camp last w/end (fri-mon) and never used their wash bags

Thanks everyone.

I picked him up and he said he was quite relieved that I hadn't agreed to his staying. He said his friend's bedroom has graffiti on the walls and a ripped mattress with no sheets and that he doesn't understand why 2 blokes live in the house either (although he said "maybe they're gay?" which wouldn't remotely bother him or me). It does seem odd, it's a v small house so 3 adults and 3 (? I think there are 2 other children, might be 1) must be a squeeze.

Ds said when he came in 'oh it's lovely and warm here' so I think it's made him appreciate our house a bit more, which can't be a bad thing. Adn he had a lovely time, they took him to the cinema.

So all's well that ends well, thanks for all these comments.