We had a great stay at Cristina and Alexander's apartment! It's absolutely beautiful and each room has its own charm with everything thought through to the smallest details. The terrace is amazing, we bought pastries across the street and had breakfast there every morning with a breathtaking view.
In the heart of the city, close to all the sights and lots of restaurants and bars. And even though it's right above metro and noisy street with restaurants, inside is very quiet and you can't hear any noise.
Alexander was very quick and helpful with any questions we had.
Will always stay there when in Berlin!