@Ashutosh19 There are specific conditions under which you might be eligible for a refund if you choose not to complete your stay. Those are outlined here: https://www.airbnb.com/help/article/2868/airbnb-guest-refund-policy
Finding the home or the host to be uncomfortable or shady isn't really enough of a reason to get an exemption from the cancellation policy. If there's a specific problem such as a missing amenity or a safety hazard, you're expected to give the host an opportunity to resolve the issue, and report it to Airbnb if a resolution can't be reached. If the problem is more subtle, like you're not really clicking with the host or feeling the vibe, you really have to work out a solution with them directly. For example, send them a change request to advance your checkout date in exchange for a partial refund.
The worst thing one could do in this situation is walk away from the accommodation without an agreement on the refund or an attempt to resolve the issue. That usually results in losing your money.