The wrong checkin instructions were provided by the host. It’s an old school hotel/apartment building with many rooms but no front desc. So I ended spending an hour dealing with the situation. The host replies were in 30 mins intervals and with more questions rather than solutions. The place stink of chlorine and is an old beat up building. Although, some cosmetic remodelling made it look OK for a hostel. But there are much better and cheaper options available in a better location at regular hotels. Those do not charge outrageous cleaning fees. That’s where I ended up staying after unsuccessful attempts to get a proper checkin instructions from the host.