We stayed at Alan and Kasia's place for 3 nights, and had a great time. The apartment is located in Prenzlauerberg which is a great neighborhood to check out in Berlin. Pretty close to restaurants and there's a metro stop right at the end of the street so you can get anywhere you want to quickly. We didn't spend much time at the apartment, since we were mostly out exploring Berlin but it was a nice place that has all you'll need, especially loved the bathroom! Alan was very knowledgeable on the great spots to visit in the city, and showed us how to find our way around the neighborhood.