Travel for a week

Hi all, stepping out of my usual holiday bubble of Amsterdam and heading to Rotterdam for just under a week in April. I will be going around the city, accomodation next to maashaven metro and wondered can you get a ticket to cover metro/busses/trams for the week? Would an OV card be best, or the Ret card? I see mention of day tickets, but nothing to cover a week, does such an option exist? I planned to go to Ret Servicepunt when I get off the train at Rotterdam Centraal, but wanted to ask the experts here first.

Please accept my apologies in advance, as I know this must be a frequently asked question here. Many thanks.