The Scandic Paasi is a great little hotel. The location in Hakaniemi is excellent, just across the bridge from the centre of the city and an easy 20 minute walk from the central station. The hotel is tucked away on a square behind the main street, and it was extremely quiet during my stay.
As other guests have stated, the breakfast selection is huge considering the price band of the hotel with a wide selection of hot and cold options.
The only downside for me is the in room ventilation which, in common with many hotels in Finland in my experience, doesn't actually give you full control of the temperature, despite looking like a proper air conditioning control unit. This meant the room was a bit warm for my taste, but it wasn't a major issue.