As a suggestion, your professor of medieval history could have come from the Nicolaus Copernicus University in Toruń. The university was created in 1938 and has a bit of prestige attached to it, Toruń being the birthplace of Copernicus. It has numerous departments, most important of which in this case is the history department and as of the late 2000s, it catered to somewhere between 30,000 and 40,000 students per year.
Toruń is approximately 120km south-south-west of Malbork and perhaps, more importantly, it's located on the Vistula and has several rail links, two of which can be traced to the Malbork railyards.
By way of interest, Malbork Castle has a number of cellars that maintain a constant cool to chilly temperature during summer. They're located in the courtyard in the main keep and accessed by individual wide stairs but they're modest in size. There are a few vault sized cellars under the Grandmaster's Palace. Unsurprisingly, they're ideal locations for storing large quantities of foodstuffs for the long term.
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