Katharina's place is beautiful! If I moved to Berlin, I'd probably try to take it over from her :)
It was super clean, sunny, and 100% as described in the profile. Katharina made sure everything was set up for us and was super helpful in arranging everything else we needed (e.g. extra cleaning half-time through our stay, extra key when I left my inside the apartment...)
Katharina's apartment will definitely be the first one I'd check for my next trip.