Cip and Krissy were not there when we got in since we got in rather late, but we got the key from a secret location...and communication during and after our stay was excellent.
The flat is just like in the pictures so it was a really good experience.
Location is great, not too far from a very central u-bahn stop.
All in all, no bad words to say! Would definitively stay at Cip and Krissy's flat again.