There are many maps of Transylvania for researchers to find, but it is very hard to find very detailed maps of the principality of Transylvania. This is because of the time period during which it was a principality. At that point in time, people drew maps by hand.
Of course, maps changed as countries merged and broke away, and this is why the labels on maps of Transylvania changed on a regular basis.
Again, it is hard to find maps of the independent principality of Transylvania, but it is important to kmow that such a principality existed, even without the influence of Vlad Tepes.