Unable to answer "What are the opening hours here?" – Χριστίνα Γκετελμαν ΚαβουριδηΔερματολόγος Αφροδισιολόγος (Doctor) – https://osm.org/node/3455643156 via StreetComplete 59.1:

Not specified exactly:
Tuesday, Thursday, Friday - morning
Monday, Wednesday - evening

Attached photo(s):
https://westnordost.de/p/243302.jpg