I definitely recommend Elin & Joakim's apartment! We booked quite last minute and they were very quick to respond. The apartment is very easy to access from the main train station by foot. It is seriously stylish and very well set out, fantastic to have a decent kitchen as well as the option of a washing machine. Only thing we thought was a bit odd was that we couldn't see any blinds for the large windows - which didn't bother us, but could be a problem during the long sunlight of summer. We will definitely be staying here next time we are in Oslo!!