A lot of younger people don’t realise that the lint drawer needs emptying.
If the house is otherwise spotless, they aren’t unclean people, they will simply be naive that it needs cleaning out. So, personally, I wouldn’t put it in their review, because they just simply won’t realise.
Instead, I’d begin with saying, "I’m not putting this in your review, because I’m having a fantastic time, but I just really need to let you know this for the future, because you probably don’t realise bla bla bla, and end it with - it’s how some fires in the home start " and end it again with “but I like I say, I won’t mention it in your review.”
Or wait until they’ve left their review and then tell them, and just say, you didn’t want to mention it earlier, incase they thought you weren’t having a great stay"
Just do them a enormous favour and let them know they need to clear and rinse it. Also, definitely show them your photo, before and after, because that way, it’ll hit home just how much of a fire hazard it was, and you could have potentially saved their lives
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I see the water drawer is excusable anyway, it could have simply been forgot about in the rush to give your fresh bedding and towels, and get on top of the washing for their holidays etc, dryers should stop anyway when the water tray is full anyway, we’ve had a full water tray in quite a number of sits we’ve turned up to — I wouldn’t hold that against anyone, I don’t think I would ever forget, but if I did, I’d hate to be marked down for cleanliness because of it.