I got to page 8- haven't read the last two pages. Anyway, as pp said ,socket covers are a danger, do not use them.
Otherwise. We have stayed in a lot of cottages, from the rural decrepit but interesting (bats flying around INSIDE at night, mouse poo in the toaster). To the gorgeousness that is the Landmark Trust. I suggest a weekend in a Landmark to get the feel of just how right it can be. Personally, I don't own a tumble drier, so towels can be not-so-fluffy, fine with me. Bed linen should be white, linen or cotton, and pristine. I can put up with lack of mod cons, I don't mind that at all, but I HATE a cheap mattress. That has ruined several holidays, and in one case , when I had slept on one so cheap and knackered that there were springs sticking up into my back, left me in pain for a week afterwards (dodgy back). Don't buy one so firm that it is like sleeping on the floor either, medium firmness suits most people. The other things that have spoiled a holiday are terrible lighting (stayed in Griff Rhys Jones's beatiful Welsh farmhouse, stunning, but the lighting so bad one could barely see to eat, clearly he had never slept there), terrible sofas ( GRJ again, a sofa with a really low back, nice to look at but no good for lounging and relaxing while i tried in vain to read in the gloom) And thin curtains that meant small children wouldn't sleep until 11 and then woke at dawn, hence grumpy for the entire holiday. Bedrooms should have curtains thick enough that mean a child can go to bed at 8 in the Summer and it be dark, and not just the children's designated room, as ours always sleep in with us. That is the basics covered. I like a decently stocked kitchen, as we tend to cook. I really like it if there is a bit of milk in the 'fridge, and some sugar/tea etc as we often forget to bring something. Warm on arrival in Winter is important with small children. Smoke and CO1 alarms. Info on nearest doc/A+E, vet etc. just in case! It obviously has to be clean, but I don't mind roughing it in other ways if the bed is lovely and the house warm enough.
In Summer check for wasps nests about the garden and deal with them, they can ruin a holiday, esp for me as I am allergic to the sting.
I like interesting books about the place, and enough loo roll to not have to run out and buy more on day two. A bar of soap in the basin (many places don't have any hand soap). But lack of soap or loo roll wouldn't put me off returning, a hard or knackered bed would.
Anyway, it is a beautiful house, so good luck !