Over the years I have thought a lot about this, having stayed in many cottages! Right:
Bed must be at least as big as my king sized one at home.
Windows in bedrooms must have decent blinds / curtains. Amazing how many have flimsy ones which let in light. Disaster with young children in summer, but also not good for adults.
Coat hooks or a coat cupboard vaguely near the front door! Again, amazing how many don't have this!
Somewhere to put your wash bag in the bathroom. Eg a couple of little shelves. Absence of this annoys me! And somewhere to put your toothbrush / toothpaste.
Yy to enough cutlery and crockery that you don't have to wash up after each meal. Dishwasher pretty essential too.
Not that bothered about a tumble drier. Don't have one at home.
Wifi.
Some toys/ games for children is always brill for the novelty factor and to make them feel welcome. Don't supply art stuff. It will just get messed up after one stay.
ALL light bulbs working. Or at least some spares (but I would resent changing them).
Bedside lights! Please! So annoying when there aren't any. And a bedside table for my alarm clock/ lipsalve/ glasses. Again, really really annoying when you have to leave your glasses in the floor by the bed.
Stay in the place for a night and you'll quickly realise what's missing.
Clear instructions about what to do about the rubbish/ recycling.
Not too bothered by the dog thing, although would prefer no dogs.
Pint of milk in fridge.
No need to supply bedding for the cot. I wouldn't expect an actual cot - can't think of anywhere we've stayed that had an actual one, just a travel one.
Re sharp knives - why don't you supply a knife sharpener? Then people can sharpen their own knives. Blunt knives also a pet hate of ours.
List of local pubs and restaurants you recommend.
Tea towels. Annoying when there aren't any. Or there's just one for a week's stay.