we loved Tallin, nice and friendly people, medieval old town almost everything renovated in the last years. Everything in walking distance. We had a complimentary bus shuttle from the estonian tourism board.
In Helsinki we had to pay for the bus to the center and then we walked. It was on a saturday, so many finnish people were on the streets with music and different entertainments.
Nice and cheap market near the ferry port in the middle of the town, good for buying amber and special pens made from curly wood. thats a great gift for the people at home, better and much more artistiv then in Russia.
Also great designer things, you will not find in other places in the world.