We had a great 3-day-stay at Oslo with Nhat's Airbnb as our base :) Great communication with Nhat - he was really helpful! Rooms are clean, no cooking appliances available but there's a water cooker, a fridge and Nhat provides coffee, tea, ramen and softdrinks for free :D Would totally recommend.
Place is in walking distance to a supermarket (Spar) the metro and busses.