Finland is not a cheap country for tourists, and living in Helsinki will cost you a fortune. Especially if you prefer to live large. The average price for a double room in hotel 5 stars is about 180 EUR, but can exceed 250 EUR. This amount includes breakfast.
Almost as comfortable in Helsinki's 4-star hotels. Prepare to pay from 160 EUR per night.
Hotels with 3 stars will be much more affordable. Here a double room with breakfast will cost only from 70 EUR.
If you come to Helsinki with a large company, it will be convenient and profitable to rent a whole house. Renting such accommodation will cost about 400 EUR per day.
The most affordable option is to stay in one of the hostels. You will have to pay about 20 EUR for a bed in a 16-bed room.