Allowable expenses for IRS - (Short term rental income, Non Portuguese resident )

It seems not many things are tax deductible in this situation but I am getting confliction information in my research. I had assumed that if I am renting short term, that the electricity and Internet bills would be deductible expenses, but I am told by an accountant that is not the case. Can anyone here confirm or refute that?
What about bank fees and mortgage interest?

So far it seems that only IMI and Condo fees are deductible
Thanks in advance!