Trying to place Berlin as the whole of Europe is pretty unfair to the rest of Europe (considering it contains a wide variety of cultures and expectations on working life). Also, people referring to 'EU work life balance' are probably really talking about the much more substantial labor laws in the EU compared to the US, rather than meaning that they only work 2.5 hours a week for 90k$ or something.

I can't say I've had the same experience working for start ups in London, in fact I've had the opposite - competitive pay (probably about 20% less than working in tier 1/2 banks but above market in industry), good benefits (incl. private health, gym etc.), fair work life balance (incl. holiday days and WFH policies) and rewarding work with intelligent colleagues. Non-EU/UK workers that I've worked with have the same experience as far as I can tell (perhaps even more positive, considering that some of them require visa sponsorships).