In Berlin too: salaries stay much the same, but rents are skyrocketing. In 2010 a 40sqm apartment was around ~400/500€ in city ring, now they are around 700€, and the price is always without electricity and internet connection, which are extra.
If you look for a 90sqm apartment, you have to plan 1400€ at least. In general, the more rooms you want, the more you have to pay for.