I don't know about levels.fyi (they want me to register / upgrade to see what salaries are like in Amsterdam), but I gave some more details in another comment: https://news.ycombinator.com/item?id=37359237
In short: I'm working 4 days / week (3 billable days, 1 overhead) and earning about double of what I'd otherwise get. Though obviously I'm taking additional risk. You are right that the healthcare side of things is covered.