The state pop ups your income to 800€.
Which allows you to live in a small Appartement outside the city and still have like 400€.
If you are not an alcoholic or smoke you can live a good live. And. Have free and good health insurance.
Source: my mom is in exactly that situation. Pension is only 600, state ups it to 800. She needs to move to a smaller appointment to live now. But she is now some without kids and stuff. No need for a big two or three room apartment.
I know it is sad for old people to move. ( I see it with my mom)
But in live you grow and later you shrink ( home size, income etc etc) it's normal circle of life.
I bet I will be sad when I need to move out of my three room Appartement.