I would highly recommend Siw and Henrique as hosts for your time in Oslo. They are warm, open-hearted people who have traveled a lot and clearly enjoy meeting people from other places. They made me feel right at home in their cozy apartment (as is common in the area, the apartment is small, but it is also newly renovated and has everything one would need). They even had set aside space in their fridge and bathroom for me to place my things. Siw was also extremely communicative prior to and during my stay, giving me very helpful and detailed instructions for arriving from the airport via public transit and answering all of my questions about visiting Oslo. I hope to return one day soon!