As M. Cazacu mentions in his book, Vlad Dracula was born between 1430 and 1436, most probably in Sighişoara (Schassburg, as the town was called in the XV-th century). The house that has now a plate saying this was where Dracula born was used at that time as mint. And is known that Vlad Dracul, his parent, was in charge with the mint, between 1431 – 1436. Therefore, we can accept that he lived in that house and consequently, that Vlad Tepes was born there. In 1442, Jean de Wavrin (uncle of the Burgundian knight Waleran de Wavrin that led an expedition against the Turks, on lower Danube) mention the only son of Vlad Dracul (Vlad being imprisoned by the Turks) as being about 13 - 14 years old. So Mircea, the first son of Vlad Dracul was born around 1428-1429, therefore Vlad couldn't have been born before 1429-1430.
Meantime, when Vlad Dracul took the throne of Wallachia, in 1437 he mentions his two sons; therefore we can suppose Vlad’s birth to be between 1430 and 1436. So, in his house next to the clock tower in Sighişoara.
Adolescence of Vlad III (Ţepeş) was not the most peaceful possible...