I stayed here with two friends for a long weekend in December to visit the sights of Berlin and the Christmas markets. The apartment is very well located for exploring the city, being right next to a U Bahn stop.
The apartment itself is even nicer than the pictures suggest! Having a bedroom for each of us felt like a nice luxury, especially for the price. However, you could comfortably fit far more than 3 people in the apartment! I imagine the balcony would be a nice place to sit out in warmer weather.
Check in was very straightforward and Max & Marleen were always quick to respond to messages before our arrival.
Would definitely recommend this apartment if you’re staying in Berlin.