The apartment is located in a huge old building on Karl-Marx-Allee, close to the U-Bahn Station Weberwiese. The building has an elevator, so don't worry, you don't have to carry your luggage up many flights of stairs! The apartment was very clean and tidy, and the room itself was very large and had a nice view over Karl-Marx-Allee. René and Marysia were a pleasure to stay with and provided good tips on where to go and what to see in Berlin. Thanks!