Since you are Hilton Honors Gold, and don't want airport location, you might fancy Hilton Helsinki Strand, Rather central, walking distance to many city sights, but conveniently located near Hakaniemi square, with stops for metro, trams and the regular bus from the airport. Executive Lounge with good service, drinks, cold and hot hors d'oeuvres 2h, all beverages left til 23.00

Another Hilton is more peacefully located a stone's throw away from a posh villa district, Hilton Kalastajatorppa. Tram end-station (IIRC, line 8) 5 min walk from hotel entrance , No EL, but a good restaurant.

Splashing it a little, Hotel Kämp, previous SPG property, (Luxury Collection) has the most central location, right on Pohjoisesplanadii , with named suites with very varied and impressive interiors, very good restaurant a, bistro and bar, bus short walks to many city restaurants as well.