Maybe if the villa is somewhere like the Canary Islands, Ikea is more expensive than it is in mainland UK or Europe?
But I agree that the bed must have been treated pretty poorly to have ended up in that state. Was the 9 YO jumping up and down on it perhaps?
Ikea might be able to just supply new slats to replace the broken ones, or they often do different bases, so you might be able to buy a different, more sturdy base. Despite what people keep saying, most Ikea furniture is perfectly sturdy and durable, if assembled correctly.
Don't see a problem with food in the fridge, like a PP, I assume that the cleaners might take it. They should have taken the rubbish out though.
OP do you tell your guests what to do with rubbish? I've rented in Spain/Canaries a few times and there are often communal bins out on the street somewhere, but the information folder for the property usually says something like - the bins are at the end of the street outside X restaurant.
Stained furniture is annoying, but like PPs have said, you need to accept that people will spill things and have easily washable covers, possibly with a stain resistant coating. White may look nice, but it's hard work to keep clean so not what you want in a holiday let.