Cozy spot right in the center of Oslo, with a 5-20 minute walking distance to most of the major attractions. Authentic Norwegian / European living. Useful amenities such as a big TV, desk for working, closet, sofa, dinner table, and drinking water straight from the tap. Don't get lost while in the shower though, as the hot water ran out for me on the first night (which I had no problem avoiding in all the subsequent nights).
Marcus himself was very friendly and introduced the various amenities to me when I checked in, and was extremely responsive to any questions I had on the following days, typically starting to type out a response as soon as I messaged him! For my 5 day lone trip to Oslo, his place was perfect.