The craziness level depends on the hostel. There are quite different types around the city, and some of them have regular on-site parties.
Kluuvi is a downtown area and the best option to stay in. The reason is simple: almost everything you need (a lot of tourist attractions) is in walking distance. The best bars and clubs of the city are located there, so you have lots of places to choose from to have an amazing nightlife experience.
Dont expect wild on-site parties in local hostels, but do expect fun and memorable stay. Most of the hostels are located in famous party areas, with local bars and clubs just a step away.
Helsinki has several party districts located in the city centre and surrounding. They all have more-less the same types of bars and clubs, with a similar range of prices.
Kallio is a famous students’ area with tons of shops, restaurants, bars, and clubs. The neighbourhood is hosting regular events and festivals, especially during the summer. Kallio is perfectly connected with other districts and just a short ride away from the city centre.
Kaiku is a late-night dance club, located in the former factory. The place is hosting crazy parties with local and international DJs. If you prefer bars and cosy atmosphere, Populus is a lively karaoke bar with a wide selection of beers and cocktails.
Kluuvi is one of the most vibrant districts in Helsinki, very popular among celebrities and wealthy locals. The area has tons of cosy cafes, elegant lounges, and sophisticated rooftops. For late-night hours, Kluuvi has an amazing offer of dance clubs and pubs with live music.
On the Rocks is definitely the place you can’t miss. The club gained a high reputation thanks to the crazy parties, bar games, and live events and music. Just down the street, there is another cool place called Shot Bar. The service is great and the cocktails are one of the best in the city.
Right next to the Kluuvi district there is another fun party zone called Kamppi. The area is the home of awesome waterfront bistros, hip bars, and LGBT clubs.
Mann’s Street is one of the most famous in the area, thanks to the vibrant atmosphere and wide selection of drinks. Just a short walk away, there is a popular Tavastia club - the place for true rock fans. Live bands and concerts are regularly on the menu for the past almost 50 years.
Compared to other capitals in Europe, Helsinki has easy-going rules when it comes to the dress code in local bars and clubs. Although fancier clubs might require a jacket and long trousers, bars, and underground clubs are okay with a casual look or smart casual.
If you want to buy alcohol in Helsinki, by law you should have at least 18 (for beer and wine) or 20 (for spirits). Most of the clubs have security guys at the entrance checking the IDs, so don’t forget to take yours with you. Although bars and pubs have less rigid rules, some clubs don’t allow entrance to the people younger than 20 or 21.