My experience in Berlin was amazing. It rains every single day, but me and my boyfriend enjoyed and liked this city a lot. Claudia and Lucas are very friendly and their apartment is so warm and comfortable. We booked the lounge room.
The apartment is located in a really nice street, closed to different metro stations (the closest one is Senefelder Platz (U-Bahn U2)). Alexander Platz is just 10 minutes walking.
In the apartment's area there are nice bars (to have a good coffee in the morning), and a good organic market.
We really would like to come back to Berlin and if it will happened, we will choose Claudia and Lucas' apartment again :)