We enjoyed our stay in this well located apartment. Check-in was seamless. I would note that you can take a few of the trams to the apartment (from the train station) if you don't want to walk through the hustle bustle of the immediate neighborhood of the train station. If you are traveling lightly it is an easy walk from the station as accurately noted. It is also right on the edge of Grunerlokka as others have noted which puts you at the footstep of one of the best neighborhoods in the city.
The space was very clean with modern appliances and adequate kitchen supplies. The bedrooms are tiny, even by Manhattan standards (I think this is accurately depicted in the pictures). Given some of the issues with air flow (due to its ground level location facing the courtyard) in the apartment I think those bedrooms are best for 1 person in each room rather than 2 people. We were 6 (2 adults and 4 children) in the apartment and I would say it was a little bit tighter than I expected. As others have noted the apartment isn't really bright at all due to its location on the ground floor facing a courtyard. If you aren't there much during the day it doesn't really matter, but for those who are looking for a nice sunlit apartment, this may not be the best pick.
Overall we had a nice stay and would recommend it to a group of 4 people or less who value the very convenient location of this apartment.