Karen and Rob are very welcoming, nice and helpful. The house is clean and comfortable They took us to the supermarket, and let us cook our meals, allowing us to stay in and relax after a 2 day trip traveling to NZ. Their home is in a great location, walking distance to almost eveything in Christchurch, yet just outside of the city bustle, crowds and noise. We were able to see everything on our list in 1 long day since we were so close to the CBD.
An added beefit is Rob will pick you up and drive you to the train or airport for fee. Make sure you ask how much beforehand, as we were taken by surprise at one of the charges.
All in all, I recommend Karen's accommodations.