Surprising to give any post office 5 stars, but I really like this location. Yes, the lines can get long but if you have everything set up correctly on your envelope or package, the machine is a much faster option. Only caveat is you have to pay with credit or debit card.
I was sending quite a few letters internationally and the folks at the counter very patiently and kindly explained some of the restrictions. For example, I had something that was a bit thicker in one letter, and they helped me figure out how I could send it without paying an outrageous fee for shipping internationally.
Location is open Monday through Friday from 8:30am to 4:30pm and Saturdays from 8:30am to 3:00pm. I've found 3pm on weekdays to be my sweet spot of no lines.