Hi!
Tallinn is a very nice little town, especially the old town. There are lots of little alleys, nowadays nearly all of the houses in old town are restored. Earliest from the Middle Ages.
The service in Estonia is not necessary very good, because of the Soviet influece, but is getting better. Don't go tourist traps like SadaMarket in the harbour of Merekeskus near centre towards harbour. They are aimed for the mass tourists from Finland and Sweden with all the pirate T-shirts and stuff.
As a woman, I appreciate the beauty treatments, manicures & so on, they are very cheap, but well done usually. Prices are very high in the centre, but further away they are a bit cheaper. Average Estonian does not earn much, it is impossible to think how they can manage in Tallinn.
There are many nice places to eat, look also
http://www.tourism.tallinn.ee/ in english, too. There are also lovely handcraft shops in old town, worth a look!
Also if you have time, you can visit Pirita, it was 1980 olympics the sailing centre. On the way you can see the Estonia shipwreck statue as well.
Hope you find this useful. Have a nice journey to Tallinn! And take a lot of pictures!