Hertz - Anyone ever rented from Hertz at Boston Sheraton?

We're staying at the Sheraton Boston and then renting a car to drive to Rhode Island for a couple of days. So it would be very convenient to use the Hertz counter there rather than going to the airport. We have a $50 credit from Hertz for them not having our requested car the last time we rented a car. Does anyone know how big the Sheraton Hertz counter is, if they have a fair selection of cars, are they open every day?

I haven't rented there, but I'd say that before you go back to Logan, consider the Hertz location just off the common in the garage behind the Four Seasons. I think this is probably where the Sheraton gets their cars if they're short. But even renting there I've never found a great selection, but the airport fees are so high at Logan (not to mention the Ted Williams Tunnel toll) that I'm willing to suck it up and rent in the city every time it is an option.

are they open every day?

The website says 8 to 4 seven days a week

Thanks for the replies!