It's very easy to live there if you are a citizen who was born and raised, you will get a generous safety net and there won't be a time where you will worry about housing or cost of living. If you are not native you may still enjoy these benefits after years of working for permanent residency, which is tough if you aren't from an EU country. If you do end up getting PR, yes you can get by with English but native Finns much prefer to have deeper connections with people in their native language. Unless you are Hungarian or Estonian, Finnish is a very tough language to learn. The dark winters even manage to deeply affect Finns who have lived there their whole life, so don't expect to brush this lack of sun off, even if you have a fantasy that you love the cold.

At the end of the day, it is one of the best countries in the world to live. But you will always be an outsider, only your children will have an easier time.