@Serpent "Tacco 12" refers indeed to the heel height and, more specifically, to the "standard heel size" women should wear to "be sexy"…pretty much anywhere, any time.
Regarding the video: the girl was born in Ukraine, but she grew up in the region called Marche (I don't think there's an English translation) and is now living in the city of Vicenza, which lies in the Veneto region. She must have spent a long time here in Italy, because she speaks with a clear Venetian accent. It's quite easy to identify it because its intonation pattern is rather peculiar and…quite musical I'd say.
(Italian translation below, it's not literal but I hope you'll find it useful
"Tacco 12" si riferisce appunto all'altezza del tacco e, nello specifico, a quella che viene considerata l'altezza standard che una scarpa con il tacco dovrebbe avere. C'è un po' quest'idea che una donna debba indossare scarpe così alte praticamente sempre per essere "sexy".
Per quanto riguarda il video: la ragazza è ucraina, ma è cresciuta nelle Marche e ora vive a Vicenza, in Veneto. Deve aver passato molto tempo qui in Italia perché parla con un accento veneto, piuttosto facile da riconoscere per via dell'intonazione che ricorda un po' una cantilena.
@Cavesa You're welcome! It's sad to see the attitude certain people have toward foreigners. They have no idea how hard is to live in a country that's not your own or even simply learn another language.
Technically the region whose Italian is closest to the original Italian is Tuscany. As far as Trentino goes…well in some parts they don't even speak Italian, but German so…that's not a region I'd pick
Trentino has two official languages, German and Italian, but due to historical and cultural reasons in certain areas the first language is German, whereas Italian is taught from elementary school onwards (and sometimes it is only spoken at school). I'll ask my sister about Italian TV shows, most of the times they are soap operas and…I really cannot watch them. She, on the other hand, is a big fan of all that stuff XD
The safest method I know to learn the correct pronunciation is taking a look at the phonetic spelling, if you are familiar with it. Unlike Spanish, we use accents only on the last syllable, but dictionaries usually provide the phonetic spelling for every word. Phonetic spelling also gives a lot of indications about the type of vowel/consonants, their sound and the overall pronunciation. Unfortunately things like the open/close e may vary from region to region, which is why phonetic spelling is your best bet. Another option would be to read book, or watch videos about diction (dizione in Italian). Actors, singers, and so on usually take diction classes in order to speak an accent-free Italian, or rather an Italian devoid of regional influences..
I love RAI documentaries, especially two series called "Quark" (or "Superquark") and "Ulisse: il piacere della scoperta". They are one of the very few cultural shows we have. I hope you'll find something interesting! If you are interested in some specific topics let me know and I'll try to see if I can suggest you specific TV shows.