My girlfriend and I stayed in Kilian's apartment for 18 nights, and I can't recommend it enough. It's a beautiful apartment with lots of light and good feel. The neighbourhood is quiet, and it's about a half hour walk to major museums, etc., and public transit is very close by, too. Kilian was also very understanding when we accidentally lost one of the set of keys (!), and though they were quite expensive for us to replace, Kilian was very kind about. Overall I would definitely recommend staying here!