Accomodation options 

For the areas choose helsinki, espoo , itakeskus or vantaa

https://www.swa.fi/

Otherwise you can also book a place using the Air b n b apartments 

https://www.omenahotels.com/en/hotels/helsinki-lonnrotinkatu-en/

https://www.airbnb.com/ 

Accommodation facilities  (2 - 8 people in one apartment . Each has own Bed, Living room, Bathroom, Kitchen, Sauna, Balcony. Wifi)