Academica turned out to be a completely renovated "hotel-looking" hostel. The rooms are a bit more expensive than in Eurohostel, but you get an in-room bathroom, a sink, and a stove. Plus, the breakfast in a neighbouring restaurant is included in the price. Rooms are well furnished - the designers seem to like genuine Nordic style.
All the rooms are available for direct online reservation. Just check their site at http://www.hostelacademica.fi.
The only drawback is that the place is a bit far from the city centre. The 10 minutes walking from the Mannerheimintie can be tiring after strolling through the city the whole day.
On the whole, I would highly recommend staying in Academica.