According information I read in the internet that to reach to Helsinki from Tallinn takes just around 2 hours by a ship, I decided to travel to Helsinki while I'm there. It was a journey for one day long. So, I settled down in a hotel on 5 minutes distance by a walk from old town and just on 2 minutes from the sea port where ships are coming from Finland. Location of the hotel was really perfect. The tickets to Helsinki were cheap enough, just 15 euros for a round trip. The boat to Helsinki was ECKEROLINE.