I tend to book very early flights to Faro, which means I have to be up at 4am and go to Liverpool Street or King’s Cross to get the train to the airport. At that time, the buses are infrequent and it’s not pleasant to wonder through the streets alone, so I usually take a cab.
Someone that goes to bed at 1am and has to wake up at 4am is usually grumpy, sleepy and not thinking straight.
I like how AddissonLee let’s me know when the car is on it’s way, and how they are always 5 minutes early. A service well done, that is all I need.