Building an Point of Interest system with different comment types

I am building a system for POIs. We want to give the owner the possibility to add different types of comments/votes to a POI.

Like a harbour would have: Does it have W-LAN? (BOOL, once per POI) Whats the W-LAN password? (text, once per POI) Rate the hygiene rooms (vote (1-5), once per user)

I don't know, how to realize that in Symfony with the Entities.

Kind regards Henning