All of the following are great choices for almost 95% of what you need. Safe, clean, Non toxic and Natural. Easy.
I have used all of them on my own walls!
Graphenstone Grafclean (Top selling Graphenstone interior wall emulsion paint)
Graphenstone Grafclean Eggshell (Satin Matt, harder wearing than above, more washable)
Auro 555 Emulsion – (Top selling Auro interior paint)
Tester pots available on the product page & hand painted colour charts available