The apartment was fine, it is perfectly comfortable for a base while exploring Stockholm. It lacks any home comforts or nice touches, and the check in instructions are not helpful. As the other reviews have noted you need to look for the door which says 'Data Resilience' and ignore the check instructions which tell you to look for a sign saying 'residence' as that's not correct.
The bathroom was also not great as the shower is small and super awkward and is separate from the toilet which is also tiny and awkward.
But the beds were comfortable and the place was clean and had a bit of old-building charm, so in the end it is comfortable enough to stay in and reasonable for the price.