I highly recommend staying at AC's place. I had a fantastic stay. The apartment was sparking clean and had everything I needed. It was super quiet too. AC was quick to reply to all my messages. Public transportation, coffee, and grocery stores are all steps away.
It was extra nice to have a TV with cable. I'm trying to learn Norwegian and it was helpful to watch Norwegian TV shows and also see shows from home in the U.S. with Norwegian captions. :)
Before I arrived I didn't know much about the area but Aker Brygge and Tjuvholmen are gorgeous. I'll definitely be recommending them (and AC's place) to everyone I know who visits. Thanks, AC!