How do you feel when you grow your plants in pots?

It depends on the plant and the pot it is in. Some will not respond well to being potted as they have larger root systems, so I tend to make sure the plant I have potted is going to be suited to it and have not had any issues.

How do you get a better soil for your growing plants?

This depends on the plant as some like different soil qualities, more or less acidic etc. I make sure there's loads of earthworms, use manure and seaweed extracts, many different things depending on the needs of the plants.

Do plants in pots still looks fresh like those planted directly to the ground?

Yes.

You mentioned how one can use his window as a garden for his or her plants, how will it looks like.

Imagine a window sill, now imagine small pots with plants in them sitting on the window sill.