...well, if he gets this money as a loan, maybe the parents/grandparents are also willing to guarantee for him at the bank or at least for the part of the equity, then the purchase would certainly not be a bad investment. If the apartment (of course with heating, I have never seen a condo without) is in good condition, it would also be easy to sell again after the studies.
He has already mentioned that in K`lautern the rents are about the same as the installment payments for the loan. This is often the case here. Especially since the loan term here would not be 15 or 20 years, as with building a house.
The city is full of students looking for apartments, professors, and other staff, plus nurses/doctors from the hospital and the new Fraunhofer Institute also has a constant need for housing. Apart from the many software companies around the PRE Park. So, just talk to the bank and if it works out, buy!