We had a great time in Oslo, staying at Johan and Rannveigs apartment. Every detail seems to be thought through - there are eco cotton towels, eco shower stuff and so on. Also, the kitchen is really well equipped and there was even bread and good coffee waiting for us, when we arrived.
Moreover, Johan and Rannveigs are great people - so easy to get along with and since theit baby boy is just a couple of month older than our toddler, Rannveigs even gave us some shoes which was super sweet (thanks a lot again, Rannveigs :-)).
Oh dear. And then the area. It's great! Right by a beautiful river. All in all, an excellent option when staying in Oslo.