There is a cruising guide that you might like: "The Sea of Archipelago and the Gulf Of Finland" which has photos, written descriptions and schematic charts of the harbors and cruising grounds of Finland. The text is in English, German, and Russian.
I bought mine in Helsinki, but the publisher has a website/store:
Satamakirjat :: Lokikirja :: Meripartiolippukunta Turun Partio-Sissit ry
This guide doesn't contain full-featured charts, but it could be pretty useful.