@Pedro1814 The ROI touted by arbitragers and other STR promoters depends on the property, the location, the size, the competition, the market ... I could go on and on.
Set your sights low. How much can you make if it is rented for only 10 days a month? Did you take into account outrageous utility bills (because guests will leave the AC or Heat on full blast with the doors and windows open, all lights on and showers so long you run out of hot water). How much do you have to pay for housekeeping or your own time cleaning between guests? Are you available at a moment's notice to unlock the door, replace a beeping fire alarm battery, or answer an inane text that arrives at 2AM?
My advice...for every dollar that you expect to earn, 50 to 75 cents will go to services, taxes, upkeep and maintenance.