What do I need to know before retiring in Berlin?

"Before retiring in Berlin, expats should familiarize themselves with the local language, as most people in the city speak German. It is also important to research the cost of living in Berlin, as it can be quite expensive. Additionally, expats should look into the healthcare system in Berlin, as it is different from other countries. Furthermore, expats should research the different neighborhoods in Berlin to find the one that best suits their needs. Finally, expats should look into the visa requirements for living in Berlin, as they may need to apply for a residence permit," said another expat in Berlin, Germany.