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The least expensive option is going to be to create white noise.
Otherwise, you'll need some type of sound insulation and dense pack cellulose might be able to be retrofitted into the wall cavity. But determining your level of performance expectation is the hard part. How perfect do you expect it to be? Is this a common wall to another unit, or all enclosed within yours? It makes a difference.
Most hardwood floors can be cleaned easily with a microfiber mop and a natural cleaner such as Mohawk's Floorcare Essentials Hardwood and Laminate Cleaner. It is all natural, works great and doesnt leave a hazy film on the floor. As with any product you use, make sure you test it first in a small area.
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