If you find yourself in Helsinki, Finland with kids in tow, you will absolutely want to consider a stay at the Klaus K Hotel. The room we stayed in was the Envy Room with a King Bed and it was absolutely huge. The room had a view of the street and was in a corner away from all the noise. The hotel itself was very centrally located right near the Esplanade park and only a few blocks from the Market Square ferry terminal. Down the block was a Circle K supermarket (kind of like a 7-11). The only downside was that it was 2.5 km from the ferry terminal where the Tallin ferry gets in which can be kind of pricey in a taxi.
The hotel staff was amazing and very helpful with every request. We didn’t have a chance to eat breakfast at the hotel, but it looked like quite a spread.