Toplu taşıma ile Anadolufeneri nasıl gidilir?

Anadolufeneri is not the object but an adverbial of place in the equivalent active sentence (gitmek is intransitive). Still it has been raised to the position of the subject in the passive sentence.

If I were to convey this meaning I would try the ımpersonal way:

                           Toplu taşıma ile Anadolufeneri´ne nasıl gidilir?

Is it correct?

Yes, it is correct.  In that sentence, dative has to be added to the name of the place cus of "gitmek". In that website, there is couple of more grammar mistake. So you are right.

Thanks, tunci. But I am still curious. Is this a mistake no Turk would make?

You are welcome Abla. I haven´t met any Turk that made that mistake yet. A Turk would put dative automatically even when he/she is talking in his/her dream.