Used Payless numerous times with no problems.
When their shuttle gets you to their office (north airport exit, left at first light), a few miles have been shaved off of your trip to Disney. Leaving their lot take a right instead of their suggested left. Less than a mile is next light, take two quick lefts to get on Toll 528 (Beach Line). One 75 cent toll, then you get to I-4. Go west (southwest).
Returning the car taking I-4 east to 528 east, get off 528 at its exit 9 (Tradeport). Left and cross under. Nice cheap gas station on your left. Get into middle lane. Required right (east) onto McCoy and Payless is on the left a little less than a mile. (For most other rentals less than a mile to next light (Semoran; 436), right for airport, left for Hertz/Thrifty.
Be very careful driving around their office both in and out. If you go into the wrong driveway you will get flat tires.
Payless, EZ, L&M, and a few others reserve the right not to rent to you if you don't have collision insurance on a car of your own back at home and you decline theirs.