Unable to answer "Are these opening hours still correct?" – Lettukahvila Kalliolinna (Cafe) – https://osm.org/way/487334221 via StreetComplete 58.2:

Yes, the opening hours are right, but only in the following period:

Avoinna 25.5.–18.8.2024:
joka päivä klo 10–19

https://lettukahvilakalliolinna.com/yhteystiedot/