Birgit and Hassan are lovely hosts, even treating me to Arabic coffee, chocolates, and other delicious delights throughout my stay. Their apartment is in a beautiful area of Kreuzberg (the architecture, the canal, the food and cafés [check out Mitteleuropa for affordable but yummy fare and generous service nearby]), extremely close to public transit, ~20-35 minutes from anywhere you could possibly want to go in Berlin. Top floor of a walkup, so you’ll get your steps in for sure, but for a lone traveller visiting friends was great. Thank you again!