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ADVICE Please: Cost of Living& job offer BERLIN (Berlin)

I ve got a potential job on hand to move to Berlin. I have read that Berlin is quite affordable compared to other European capital. My situation is as follows: I used to live in London with an "comfortable " salary.I've moved to Vienna and agreed to take a a pay cut as I had less expenses( free rent and less bills) .
The job offer in Berlin would be about Protected content without 13th month. My questions:
Are they any website where I could compare electricity & Internet providers?
Is is acceptable to negotiate on social benefit like holiday allowance or use of a company mobile phone?

Thank you !