There was quite a queue at the Boston airport pickup point, but the counter service was relatively fast.

During the pandemic, they provided detailed information.

Renting a car in the US is really convenient. Upon landing, a shuttle bus takes you to the car rental lot. You present your driver's license, international driving permit, and passport, authorize a pre-payment, and they tell you the parking spot. When you find the spot, the car keys are already there waiting for you. Just drive away. Returning the car is even easier. Drive to their parking lot, and an employee uses a device to inspect the car, then provides an invoice. In less than a minute, you're done. We even changed the return location twice during the trip, and they agreed without any hassle. Highly recommended.

I don't understand why I was charged an extra $39.85 at the end.

Not bad.