Why would you stay in Rotterdam when Amsterdam and Brussels are both short train trips away. I would fly into Amsterdam, spend some time, and then take train to Rotterdam day of sailing; or fly into Brussels and do the same.
"The test of a first rate intelligence is the ability to hold two opposed ideas in the mind at the same time and still retain the ability to function."
F Scott Fitzgerald
Silversea Silver Explorer (23nts) - Kangerlussuaq, Greenland - Nome, Alaska - Aug 14
Seven Seas Voyager (30nts) - Dubai - Cape Town - Nov 14