We didn't actually get to meet Johannes or Johanna but a very nice man was waiting to greet us, and didn't mind that our flight was an hour late.
The apartment was fantastic, and exactly as described/seen from the photos. Exceptionally clean, masses of cupboards and the Nespresso machine a bonus.
A perfect location within close walking distance of cafes/bars, shops and 10-15 minutes walk from major tourist spots.