We had a good time in Helsinki at Hotel F6
Pros: The hotel is well located in Helsinki. The breakfast was superb. Staff was really friendly and helpful. Because we had to leave very early on our last day, they prepared a delicious breakfast to go for us. The bar next to the hotel is great, too. Cons: The room is soundproof. We could barely hear the construction site next to the hotel. What we could hear, though, was a man singing from another apartment through the air ventilation system. But the staff had a solution for that, too ;)