I have a vermicomposter in my kitchen. It's made from a stack of plastic tubs. Bottom tub catches the liquid "compost tea", the middle one has older compost, top one is the active one. I add vegetable and fruit scraps, coffee grounds and filters, shredded paper and egg cartons, rinsed eggshells and hay/used litter from my rabbit. Do not add meat/egg scraps, anything oily, dairy products, cat or dog poop (rabbit is OK because they're vegan) smelly items like onion or garlic, or scraps from citrus fruit. They're either bad for the worms (oil suffocates them, citrus is too acidic) or they stink when they rot. I freeze the scraps in a bucket, then thaw them before adding them to the composter. This breaks down the scraps and makes it easier and faster for the worms to "process". There's no odour in my kitchen from the composter, I only smell a rich soil smell when I open the lid. My worms are "red wigglers" which are a bright red colour. They're smaller, thinner and more active than standard earthworms.
For more details on composter designs you can Google "vermicompster" or "worm composter". There are lots of different designs that people have made for their homes.
