Christina's apartment is amazing -- the pictures don't lie. The interior is top rate and the building looks brand new. We loved sitting on the terrace and enjoying the fresh air. It was so much better for the four of us than being squeezed into a small hotel room. As far as location, it is close to two tram stops and a short ride or nice walk to the city center. The neighborhood was great too with coffee shops, restaurants, and a park. We enjoyed seeing the sights downtown, but then heading back there to feel like true locals. Best of all, she was super friendly and helpful with detailed emails, maps, advice on public transport, guidebooks, etc. My friends and I had the best time, and we will definitely try to stay there again when I return to Oslo.