It is a pity that now it is impossible to travel to Finland by car with Russian license plates. And so Helsinki Airport is a great hub for flights around the world. At the airport, you can wait out or sleep through long connections in clean and comfortable hotels (we prefer Hilton).
Navigation is good, toilets and waiting rooms are clean. The seats are normal. If you need to wait a day, you can buy a hostel for 45 euros at the booking office, located a 15-minute walk from the airport. The disadvantage is the high prices for food and drinks. I recommend buying food before inspection at the market on the ground floor on the left side of the building, if you are facing the airport.
There are several ways to get to the airport. Navigation at the airport is convenient, it is immediately clear where to go, there are also a sufficient number of shops, cafes and toilets. There is even a special room for recharging, in which there are many outlets, including USB.