If you indicate that you had -0- personal days, then you can deduct a loss on the rental activity, so that is why your refund increases when you do that. You should enter your personal days if you had any.
You would say you converted it from personal use to rental if you used to use it for personal purposes.
You would be required to deduct the mortgage interest for the one month you rented the property, as that may affect your itemized deduction/standard deduction choice.
I'm not sure why you are getting the vacation home treatment, but it shouldn't adversely affect anything as it won't be reported as such on your tax return and you can deduct property taxes and mortgage interest on up to one vacation home.
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