International students can get vaccinated in the Netherlands. On the website of the Dutch government and the RIVM (section 2.3) you will find information about any requirements and the time planning.
In case of (imminent) calamities international student can always call this number: 0031 - 10 794 99 99.
At this number you can reach primary support 365 days of the year, 24 hours per day and 7 days per week
Questions about housing can be sent to firstname.lastname@example.org.
Questions about practical things such as deregistration in case of premature departure from Rotterdam, can be sent to CoIA-Student Support: email@example.com.
International students who need a doctor (GP) in Rotterdam, can find one through https://gpforinternationals.erasmusmc.nl.