Prices in Helsinki:
apartment rent .- 600-1000 eur/month, dependable in which part of city for a 1 room apartment
food- restaurant - main dish - 12-15 eur, mcdonalds, big mac meal 6.50 eur.
beer in bars, 4.5 eur, shops around 2 eur.
ferry tickets - to tallinn: around 20-40 eur, stockholm with cabin in ship , around 50-60 eur.
hotels- 60-150 eur / night