I can 100% recommend staying at Alexandra’s apartment. It’s super cozy and very centrally located. The subway is less than 5 mins walking distance away with shops, restaurants and kiosks around. You can reach Kreuzberg in 15 minutes and all other central neighborhoods in max. 30mins. Neukölln is one of the less commercial neighborhoods so don’t be irritated by the apartment building :) We loved the big balcony that is facing the courtyard and the well-equipped kitchen. All in all an A+ stay!