Then, if there's a need, and your market checks out then start getting it furnished and add all of the amenities, towels, body wash/soap/shampoo/conditioner, washer/dryer, etc. 

For my rentals I do not allow access to the spouts outside for washing cars or anything.

We had even stripped the sheets and started a load of wash with all the towels.2.

There is also a great app called SudShare where you can have your laundry washed, dried, folded and returned to you the next day.

There are 13 private Home Owners Insurance companies in Florida and none of them are Solvent.

Machine wash, custom wash fold, dry clean, soap sales, concessions, etc4.  

From experience, if laundry included in the rent you will have people doing a full load for with just one T-shirt in the wash, leaving their laundry in the wash machine for hours and your water and electricity bill will most likely go through the roof (I learn't that the hard way). 

See if the tenants are having family members wash their cars there, and or laundry.

Running the cold water to wash your vegetables? 

If you do end up renting by the room make sure you mention it includes mowing the law (hire that out) and a weekly cleaning of common areas (they have to clean up, but pay someone to wash floors, windows, toilets, etc.).You might find it easier to do the whole house at first as you mentioned.