Our stay at Ragnhild's was great: the apartment is small but very cozy, you can find everything you need and it is clean. The location is quiet but very well connected to the rest of the city via tram. Grünerløkka is a hip and interesting part of Oslo with lots of little stores and cafés/restaurants.
On top of that, communication with Ragnhild was fast and very nice, her tips helped us a lot and showed us some hidden gems of Oslo. All in all we are more than happy we got to stay at her apartment and would recommend it very much!