Worm bins are designed for kitchen waste and to have a specific type of worm that does not do well in the cold. I had lots of worms in my regular compost bin, but that was a different thing. Red worms are especially good at taking care of decaying organic material: [en.wikipedia.org]

It should not attract mice if the rotting veg is covered with soil and the a lid. You are more likely to get cockroaches and slugs!

Mine love apples. I love nothing more than seeing a ball of worms inside the eaten out apple skin writhing all over each other in what looks like an orgiastic frenzy. I'm not sure if it is a sexual or feeding frenzy. Currently I have three going a 3 level round one, a 3 level rectangular one and an old laundry sink.

I just have a huge compost pile and it is full of them.

I built a large one for our garden and we kept it full. My late partner would go to the grocery store and get food that was going to get thrown out. She would come home with bags (some of which was still perfectly eatable). I still use it and empty my compost bin in it but there are very few worms and I am slowly having to let go of this garden. It is just too large and takes too much time.

I have a worm bin. It was in the kitchen but it got infested with fruit flies last fall, so it got moved to the garage. Then when it got REALLY cold I moved it into the basement. I will be moving it back to the garage soon. I love it, I switch it out about twice a year. Mine is only two bins, top and bottom; made out of plastic storage containers with lots of holes drilled in the right places. I will add the castings in the bottom bin to the garden soon, and then fill it with damp shredded newspaper. Then it will become the top bin where I add the kitchen scraps. The worm will travel to the top bin when they are finished with the bottom bin. I find it fascinating!

I have never heard of keeping one indoors. I am surprised there is no smell. Convenient for kitchen green waste, but doesn't it make a mess when you get out the compost?

I've never done an indoor one. I've always been in a place I can keep a small compost frame.

There's not a spot up here that you can stick a trowel in and not have worms crawling all over.......

I added a few worms to my outdoor compost bins . they did a great job!