I had a perfect stay in the apartment! First of all Sabine was very welcoming and helpful, everything was provided for and there's even a ring binder with useful information and tips on the living room desk! The apartment was very clean and indeed spacious & light as said. Since I was there for work for two weeks it was important to me that I would feel comfortable and 'home', and yes I totally did. By the way, I have to say I loved the shower!
The location was very suitable for me since it was just a 10 minute walk to the office and with the Warschauer Straße station very nearby you're quickly everywhere in the city.
I would stay there again for sure and would definitely recommend the apartment to everyone!