Cosy looking. Nice tables with chairs and also sections with sofas. Crockery can be mismatched but please a proper tea pot with loose leaves.
A good variety of teas, several black, green, herbal. Coffees, hot chocolate and also cold drinks. Fresh juices, smoothies, milkshakes.
Milk in small jugs
Different cakes, homemade ideally. Same with scones.
Mix of meat, vegetarian and vegan food
I love antiques on display, we have a cafe who has all kind of old/ancient phones, radios, clocks and it's always a great topic to talk about.
Books you can read, offer to buy one for £0.50-£1 if you want to take it home.
I wouldn't go for newspapers, they are quite expensive to replace each day. Depending where you are, you could get local ones which are often free or magazines/leaflets about the area if you have a good tourist foodfall.
Clean and spacious toilets.
Children books, crayons and paper. I personally wouldn't go for toys as they need cleaning (sticky fingers after a flapjack) and while I don't mind a certain noise, I don't really want lots of toddler toys making them.