zlacker

   people with low incomes should be
   able to live in the city.

Steglitz, Spandau, Koepenick, Lichtenrade are all in the city. And all have excellent public transport that gets you to Mitte, Prenzlauer Berg etc in a few minutes. People should live so as to minimise commuting. Since most of those in the centre tend to be either well-paid or tourists, it's fine that they also form the majority of those who live there (either long-term or transient).