I've never been to Tallinn, but by all accounts it is a beautiful city. Hadassah Magazine runs a richly detailed travel piece on Tallinn, highlighting in particular detail the Jewish sites and history. The article is by Jono David -- a photographer who has roamed the world documenting Jewish heritage sites (his current project is a photo documentation of Jewish sites in Africa).
You can browse Jono's vast archive of more than 61,000 images from 87 countries and territories at his web site: http://www.jewishphotolibrary.com/
In his Tallinn piece, Jono writes: "Many of the Jewish remnants of the past have few or no markers. During much of the Soviet era, the community maintained a prayer house at 9 Magdalena Street, not far from Old Town. Originally a warehouse, the extant building is in a derelict state. A prayer room at 23 Kreutzwaldi Street preceded it between 1946 and 1966, but it was demolished to make room for a hotel."
But he provides information on what there is still to see and describes today's living Jewish community and its institutions.
You can find even more information on Tallinn and Estonia on the Estonia pages of the Jewish Heritage Europe web site.