The Fitness Center at Klaus K Hotel
Klaus K Hotel's fitness center is endorsed by professional reviewers. Of the 8 publications that we tracked, 2 referenced the fitness center, including Jetsetter and Star Service.
Klaus K Hotel 
Jetsetter
Star Service
Jetsetter "The Helsinki Day Spa is in a separate building next door, but there's direct access from the hotel; the gym is open 24 hours a day"
Star Service "Fitness buffs might prefer getting their health and happiness on the latest equipment in the complimentary 24-hour gym, or pay to get facial and holistic body treatments, massages, and body and mind workout classes in the Helsinki Day Spa on the second floor"
