Super courteous and clean
I recently needed a ball cock replaced on a bad toilet. Benjamin Franklin got a plumber out on a few hours notice on a Sunday on a holiday weekend. He was courteous, professional, and beyond neat. The work was done well, he explained everything that he did, and the bathroom was left in better condition than it was when he started.
Here's the real clincher.... He also spent 30 minutes on the phone with my home warranty (who is notorious for trying to avoid paying claims and overtime) to try to convince them to agree to pay the claim when he could have simply left and hit me with a $200 bill for the visit--blaming my home warranty's intransigence.
They weren't cheap, but they fixed a dire problem, and I'd call them again in a heartbeat.