I'm recommending a new mattress as the one Sachin has is a bit worn. That said, I don't think most people will care. It's not hotel-quality, but airbnb seems to miss the mark on this regularly and unless you need a firm mattress, you should be fine. I'm also recommending a little hot water kettle in the room as without a kitchen, it's nice to be able to make a little tea in the evening, especially in a cold, wet place like Oslo. Finally, this is a budget place, so as long as that is your expectation, I think you will be happy. The bathroom could use a deep clean in comparison with other airbnbs I've stayed in, but is fine for the budget traveler. And Sachin is quite nice. :)