We have a 7:15 a.m. flight out of Madrid on a Sunday morning. I had previously booked all three of our nights in the city center understanding that taxis are easily arranged from the center to the airport.
However, I have heard that Saturday and Sundays mornings can be problematic because the bars are closing at the time we need to leave (4:30 a.m.) and public transit doesn't start until 6:00. Apparently, taxis are in extremely high demand then and even some pre-arranged taxis have been known to fail to show.
If anyone has a recommendation for a reliable shuttle or private car, I would greatly appreciate it. Or, I the interest of peace of mind, should I just suck it up and stay the final night near the airport where the hotel has a 24 hour shuttle?