The Finnish capital has a lot to offer you and you might find it useful to have a look at the website of Visit Helsinki to make the most of your stay.
Hotel accommodation is at your own expenses. The Finnish EUREKA Chairmanship team has made block reservations at several hotels in Helsinki (close to the venue) with special rates. Please note:
For a list of hotels and the instructions how to book a room with a special rate, please visit the dedicated webpage of the EUREKA Innovation Days: http://eurekainnovationdays.org/accommodation.