Dobrý den. Zkuste se podívat na oficiální stránky. Při mé recenzi se můžete dočíst že přímo do hradu jsem nezavítal. Zadarmo je pouze vstup na nádvoří a na pár hradeb

Όχι μπαίνεις ελεύθερα μέσα κ περπατάς μέσα κ πάνω στά τείχη.... άν έχει κάποια έκθεση σέ κάποια αίθουσα είναι άλλο θέμα.... αλλά για τό κάστρο μπαίνεις ελεύθερα

Io ho impiegato circa un paio d'ore,ma non l'ho girato tutto perchè poi chiudeva !!!

No problem.I got to the castel walking 2 k from my apartment I visited the castel in the morning. It doesn't take a long time 1,5-2 hours would be enought. I got the airport by underground and I had lunch in the airport at 12,30 am.

There are several car parks in and around the center of Nürnberg and within walking distance of the castle. They would be your best bet since street parking is fairly restrictive.

There is parking right outside the castle.

It comes down to have you been to another Germany old town? If not, then it is a yes. If you have and enjoyed the other one, then I would go. If you do like seeing old buildings/walls or moats, then do not go. I like old buildings and places so it was a yes for me. We saw over 6 old towns in a 7 day period. I like them all. Each had a little difference. I am not saying that it is a full day but a few hours and see where it goes from there.

Two key areas to visit: old Town and the Holy Roman Emperors Castle (walking tour); and the former Nazi Party grounds and HQ(museum now).

You don't Need a reservation. At 11.00 and 14.00 are Guide Tours. Audioguides in spanish are available.