Is there an online street map of Helsinki I can access on line?
You will find an online map of Helsinki in the Internet pages of Helsingin Sanomat. This is a free service. The site address is http://heti1.tieto.net/oikotie/etusivu and when you click the word 'KARTTAPALVELU' (ie. the map service in Finnish) you will get access to various maps of Finland including that of Helsinki. You just select Helsinki and you can search any street in Helsinki. The correct spelling of Kaivopoisto is Kaivopuisto.