Left luggage facilities – Rotterdam Centraal
Rotterdam Centraal Station is huge and new. It was very much a building site when we arrived (15 August 2013). The left luggage lockers (left) are located near to platform 17, come in two sizes (5-8 Euros for 24 hours) and require a credit or debit card – no cash. The key is a flimsy card a shade bigger than a credit card. The lockers open when it is inserted. Once open it cannot be relocked without payment.
Be informed 
I need to leave a large case (with a bicycle in it for two days at ) Rotterdam station, do you know if there is a luggage office where I can leave oversized luggage? It won’t fit in the electronic lockers.
I’m afraid not. It is four years since I have been there; I cannot find anything on the station’s own website http://www.ns.nl/reisinformatie/bagage/bagage-op-station.html However, there are some other options. Try Dropandeat: http://stopdropandeat.com/