My sister and I are taking our great niece (she'll be 17) to Greece, and plan to stay in Athens for a couple of days before going on a cruise of the islands. We would like to find a hotel room in the Plaka district, in close proximity to the Acropolis, with three beds. Any suggestions?
Try these three places. They are close to the Acropolis.
https://www.athoshotel.gr/index.php
I stayed at the Omiros Hotel last trip. They are inexpensive with a close proximity to the Acropolis. The buffet breakfast was excellent.
There are many hotels in the area. You may also find many Airbnb appartments.