score:1
If I remember correctly, it is not a mandatory field. It depends on the reason you apply to ESTA (e.g. business or visiting).
The information could be used by the immigration officer to ask further questions (about how you will sustain in US). If you are Italian, with a return ticked (and just 2 weeks), and a credit or debit card, it shouldn't be a problem.
BTW the way to add address is also not ideal. You cannot give a hotel name, but just an address, and from my experience it is also very prone to get the data wrong. (just by copying the address from the booking website). So I'm convinced that this question is just for convenience to immigration office (and to you, to have clear ideas).