I stayed with Gung and Martin for 2 nights as i was tending an education i Oslo. I really needed peace and quiet after my class, but the room was not for relaxing and it was certainly not quiet.
It was a very cold environment, and the acoustic was awful, with bare walls - no pictures, mirrors ore anything, no curtains and very thin walls, so i could hear everything that went on in the next room. Also there was a lot of noise from the street. The beds sheets were very synthetic and not soft or nice, so bring your own if you choose to stay here.
So if you need a place where you can load up and be reenergized it is not the place. I hardly slept for 2 nights and i am not coming back.
I am shure that Martin and Gung are nice people, but they need to work on the environment in the apartment, and then maybe charge a little more.