This apartment is in a great location (in a peaceful neighborhood but only a 10 minute walk from Potsdamer Platz), is very clean and had the necessary amenities, such as a fridge and a coffee machine.
Our host, Heidi, was very friendly and we had no problem checking in--she was waiting for us and welcomed us to Berlin. Similarly, checkout was very easy.
The apartment itself was perfect for a long weekend in Berlin: Comfortable bed, and multiple U and S-bahn stations within a 10 minute walk. Would recommend this place!