Susan's flat is very cosy, light-flooded, furnished with love for the detail and there's Billy the cat who warmly welcomes you when you come home. The flat is very well located with close by public transport to reach the airport and the city center (though you could walk there) and there are also small shops to buy food close by.
Jon, a friend of Susan who wasn't there, recieved us and gave us many useful tips for our stay in Berlin and for how to take care of Billy.