Mingming’s place was great. Its walkable (12-15 mins) from Oslo Central Station. He is a great host, very helpful and nice to interact with. The location is really very good, its in a much quieter locality yet very close to the heart of city.
Pro-tip: Instead of taking a bus/tram/cab, just walk to his place if you are coming from Oslo Central Station. Its cheaper, easier and you get a hang of the neighbouring areas.