If you need an elevator or modern accommodations, this place isn't for you. For everyone else: Go ahead and book it if the description and photos look good to you. The apartment has plenty of charm, and the location could not be any better. There are a lot of great bars/restaurants/shops/coffee in the immediate neighborhood (under the radar food pick: Hrimnir Ramen next to the Scandic Vulkan hotel) and it is easy to get pretty much anywhere in the city from here by foot or tram. As some previous comments stated, the bed/bedroom are definitely on the small/cozy side, but it didn't prevent us from sleeping well. (And the apartment is surprisingly quiet and private given that it's in such a bustling neighborhood.) Bathroom is excellent and nicely redone, and though we didn't cook, the kitchen looks like it has everything you could possibly need.
Note: If you are staying here in the summer of 2019, some of the streets in the neighborhood (and elsewhere in the city) are under construction to replace the tram tracks, and the closest tram stop is closed as a result. But it wasn't a problem (and the next nearest open tram stop is only a few extra blocks away).