I will say I had a good experience with the Folks at Enterprise at the location near the Port (actually just a few blocks from Bayside). They were friendly and replaced a car for me when it developed problems
Check before you rent with Avis. My understanding, from reading another cruise board (Cruise Critic) is that Avis will close their port location this month. Avis, Dollar, and probably several others do provide free transportation from the airport rental area to the cruise port.