The stay at Julia's apartment was great. The apartment itself is perfect, with a great view and very clean. The neighbourhood is good because it is central and near a lot of pubic transportation which allows you to easily visit the city. However, the building surroundings are not the most charming, and the closest shops are located in a mall on Alexanderplatz.
Overall, I would totally recommend Julia's flat. The communication with her was easy and quick. Thank you !