Should I refinance a 15 year to a 30 yr to gain cash flow wAirbnb

[Denise Fitzgerald]

I currently have a 15 year mortgage on a rental home I bought 8/1/16.  My rate was 3.25% I have a renter in the home and I just break even every month.  When I bought the home I was not interested in cash flow, just pay it off and later reap the benefits.  

I would like to refinance the home into a 30yr so I can get cash flow and the rates are looking higher now 4%-4.5%  

The renters lease is up June 1st.  At that time I would like to use the property as a vacation, short term rental.  I will put the place on several websites and Airbnb/VRBO.  I have another property I have been successful with for 3+years for vacation/short term rental.  I have 300+ reviews on Airbnb for the other property.

If I get a 30 year mtg. I am looking at cash flow of $1,500/mo after all expenses are paid that would be average monthly.  Some months will be less and some months will be more but the average would be $1,500.  Please remember I have 3 years of experience managing another short term vacation rental.

I would appreciate any advice on what to do financially.  I just don't know if it makes sense.

Thanks in advance --- Denise