Agree it’s more important to make sure the kitchen has items like kitchen rolls, sponges, sharp knives, two or three different cutting boards for meat vs veg/fruit. We have in the past appreciated having a sharp potato peeler and colander (for pasta).
It’s usually three of us staying (me, DH, DS) so three sets of towels are good to have, and extra towels if it’s near a beach.
Fast internet, USB charging plugs, board games, books and Netflix/Disney+ or similar are also a plus.
Clear instructions on which bin to use for recycling/rubbish and what to do on checkout day are nice, as is a list of recommendations (and directions) for nearby pubs, restaurants and attractions.
We’ve stayed in places like The Buzzardry which include champagne in the welcome basket alongside bread, butter, jam, milk, tea, crisps, biscuits, etc. It depends on the sort of market/price point you have in mind for the property.