New grads can get 50k in Berlin. You'd be an idiot to move there for less than 60-70k these days. I'm constantly hit up by recruiters who're trying to lure me back for 80-90k.
Talked with dozens of Berlin's startups. I don't think that any of them offered more than 55-60k for mid/senior dev roles. Some were trying even to lowball below 50k. Businesses paying more flood the candidates with quizzes, assignments, and give post-contractual non-compete to sign. They suck the sweet labor desperation dry.
The lowest junior engineer job grade at my previous company started at 50k + 8% bonus, and salaries went up to 90k base + 15% bonus for a principal engineer, with a pretty linear progression for the titles in between (mid-level, senior, lead). This company pays above average, but it's not the best paying in town, not even close. There are few ones (Amazon, eBay, SAP, car makers... even a few startups with deep pockets) that pay more than that.
If single, you will have a blast in Berlin with 45k. If you're moving with a dependent, that's a bit tight (as a newcomer, you will never find the best deals regarding accommodation, there's a fair supply of newly built apartments in Berlin, but they aren't cheap).
That's an exaggeration. Most salaries are places in the 50-60k range and if you are a senior you'll get a salary from 60-70k.
As a new grad/junior, you'll be getting around 40-45k.
45k/year is enough for a single person or even a couple living more frugal.