We spent two nights in Hermanni Hostel and were satisfied. The rooms are clean and as it is situated outside the center (10-15 minutes walk) it is a quiet calm place. The shared bathrooms are clean as well. The kitchen is big and well equipped, just as the common room. The girl at the reception was welcoming and eager to give us information and advice. The price is in the average for this kind of accommodation.
Very nice stay here.
P.S for those traveling in winter, do not miss a walk on the frozen lake just a few minutes from the hostel