We stayed at Tuan's for nights in Oct. The apartment is spacious and well equipped. The location is superb which is a few minutes walk to the dock and the royal palace. very easy to navigate from there. There is a nice supermarket just nest door. so if you do not fancy eating out all the time, grab some local produce and make your own. The room temperature is a bit high for my liking, but might be perfect for others. There are tram tracks near the property, so if you are a light sleeper, you might need to get ear plugs. but for us, we were fine with it. Tuan is a nice host with good local knowledge and every attentive. He gave us some great tips as to where to go or eat. I recommend his place. I think it is really value for money, given how expensive Oslo is, in general.
Mo and J