We (a group of three friends) stayed for a Saturday night on the eve of city2surf. The apartment is exactly as advertised. We had a few issues and Marcella responded promptly. However, the sheets were not clean, the bathroom was not clean, and it took 15 minutes for us to open the front door because the outer door lock was broken. If you have the option not to bring a car, it is probably easier given that it was quite difficult to find parking, even in the evening.
Hopefully these issues will be resolved before your stay!