As a solo female traveller, I would highly recommend this Airbnb - it's such great value! The house's location is perfect; it's just a 20 minute walk into the city, and public transport to the airport, gondola, Lyttletown, New Brighton (etc.) is right at your doorstep. Alicia is a very accommodating and responsive host.
Only thing to note is that the bathroom door does not fully close. Not the end of the world - but if you're travelling with someone special it might be worth keeping in mind :).
Will definitely be staying here the next time I'm down in Christchurch.