@Orlando162 I'm sorry you had this happen to you, but if you use a service for the first time, it behooves you to familiarize yourself with the policies first. Not knowing the policies isn't a valid excuse for not proceeding according to protocol- the information is there for you to read on the Airbnb site.
As others have said, you should have communcated with the host when you booked, not just gone there- Airbnbs are all individual, they aren't hotels. Sounds like you Instant Booked it and then just immediately went there, before the hosts even had a chance to maybe see that they had a reservation.
Demanding that the host reimburse you in cash is out-of-line behavior- the host doesn't even get paid for a booking until 24 hours after a guest checks in.
And while it's certainly unacceptable that the electricity wasn't working, if you had bothered to communcate with the host before arriving, they would likely have let you know that there was an issue.
And I don't see why you felt your life was in danger because they suggested you use candles if you really wanted to check-in. That sounds overly dramatic.