We stayed 3 nights in total and found it a fantastic stay. Gorgeous arty apartment with everything you would need with modern kitchen with a lovely balcony which we used as we had such sunny weather when we were there.
Location was great, short bus ride to the folk museum and Viking ship museum- both brilliant. A few hundred metres from the amazing sculpture park where we spent a whole afternoon and easy tram or bus ride into centre and harbour. Fantastic facilities all around, supermarket, cafes, newsagent to buy tram tickets. I think staying there made our trip to Oslo that bit more interesting!