We will be dropping off rental car in Ermioni to take ferry to Hydra. The ferry leaves early in the morning so our plan is to arrive in Ermioni the evening before. RS doesn't list a place to stay there. Anyone have advice on a clean simple hotel for 1 night?
There aren't many hotels in Ermioni, and it's likely RS has never been there, but you'll find plenty of studios or apartments for an overnight stay. Booking.com or Google Maps, selecting "Vacation Rentals," are your best friends for this kind of search.
If I were you, and if you want a local tip, ask Pop's Car when you rent the car, I'm sure they have some good places to suggest.