We had some issues getting to the apartment due to severe traffic jams and police checks, so we ended up arriving quite late and flustered. (No fault of the host). Once we got there we completely relaxed!
The apartment is wonderful and looks just like the photos. Very easy to get anywhere in Berlin. Location could not have been better.
The only slightly annoying feature is the water temperature/pressure in the shower can be pretty temperamental. It's easily fixed by playing with the taps under the sink, but it resets after using the sink, so you have to do it basically every time you have a shower.
Anyway, we loved the place. Would absolutely recommend it :)