I rented a portion of my home for about 5 months last year. How do I properly allocate items such as mortgage interest and property taxes when I also itemize?

So, when Turbo Tax asks what my mortgage interest is in the rental section, do I put what it was for 5 months or the amount on the 1098?  Then what do I put in the itemized deductions section when it asks the same question?  Would it be the amount for the other 7 months?  What about for property taxes under the same scenario when I also itemize?  Thank you!