This is an absolutely idyllic location and home that was wonderful for a break from the city. I really enjoyed my stay and would highly recommend it to friends. Anja was not in the house during the time I was there but was very accessible by phone. I shared the home with a lovely family who were very helpful.
To Do: The more hidden bays along the path to Lyttelton are fantastic to explore and the ferry to Diamond Bay runs frequently from Lyttelton.
Transport: It's within walking distance of Lyttleton (30mins) which has regular public transport or you can also try connecting with the local service which is less frequent and last bus is at 7.45. Taxis come from the city and it is approx $20 from Cass Bay to Lyttelton.
Just to note there are no shops or cafes in Cass Bay itself, Lyttelton has some eateries, I'd recommend purchasing food in Chch and bringing it with you.